How you can smash one of the biggest barriers to making a million from shares

I made this huge mistake in the past, but you don’t have to. Don’t say I didn’t warn you!

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

If you’ve set your course and aim to make a million from shares, there could be one barrier above all others that may stop you from achieving your goal.

And it’s nothing external at all. The problem is likely within you – locked inside your own head. It could be that to achieve great results in the stock market, you need to find the problem and get it out!

You could be your own portfolio’s worst enemy

Right now, you could be your own portfolio’s worst enemy. I reckon the biggest barrier to successful investing is the mind traps we all tend to fall into. As living, breathing, emotional human beings, we’re all susceptible to these sneaky bandits that creep up on us and steal our success in the markets.

One particularly nasty little predator is a thing psychologists call Groupthink. It’s a dangerous trap that affects our decision-making abilities. And it can latch onto our often-subconscious internal need for social identification. Usually, when we fall prey to Groupthink, we aren’t even aware it’s happening.

But it’s easy to fall in line with a consensus view that overwhelms voices of opposition. Often, the consequences of going along with Groupthink can be disastrous for your portfolio. It happened to me in 2007 and it could happen to you now. So be careful.

My horrendous investing mistake

By 2005, I was well-versed in the principles of successfully investing in cyclical companies as set out in the books of Peter Lynch, the one-time super-successful fund manager in the US. In 2005, I suspected cyclical sectors, such as banking, housebuilding and retailing, were trading close to the top of an economic cycle.

However, by 2007, I had a clutch of cyclical stocks in my portfolio – just in time for the horrific plunge that followed the credit crunch. How did that happen? The answer is, I’d allowed Groupthink to soak into my brain. I’d been hanging around too many bulletin boards and reading too many articles. And everyone else seemed to be chanting a similar message – housebuilders, retailers and banks look cheap. Everyone else seemed to be loading up with their shares. And so did I in the end.

That was a big mistake on my part. And it was all the worse because I ‘knew’ better. The terrible performance of my portfolio following my decision to buy those shares was entirely my own fault. But it was striking to me that I’d ended up going against my earlier conviction. And that fact prompted me to self-analyse and search for ways to stop myself wandering off track ever again.

Act on your own advice

I reckon the best way to guard against the effects of Groupthink is to firstly listen to, and act upon, our own advice. After researching and studying an investment opportunity, the best thing you can do is to follow your own instincts. Secondly, tune out bulletin boards and excessive market commentary from other ‘voices’. The best source of information is the news flowing from the companies you’re interested in.

Sadly, most private investors fail to beat the market. In many cases they underperform. So, if you want to outperform and make a million from shares, I reckon you should do your own thinking and avoid Groupthink.

Kevin Godbold has no position in any share mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

How big does an ISA need to be to aim for a £1,500 monthly second income?

Harvey Jones shows how building a balanced portfolio of FTSE 100 dividend stocks can produce a high-and-rising second income in…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

£20,000 invested in BP shares 1 year ago is now worth…

BP shares have rocketed in the past 12 months, yet analysts think the real growth story is only just beginning,…

Read more »

A pastel colored growing graph with rising rocket.
Investing Articles

A 6.8% forecast yield! 1 often-overlooked FTSE 100 income stock to buy today?

This income stock offers a high forecast yield and strengthening momentum, yet many investors overlook it — creating a rare…

Read more »

GSK scientist holding lab syringe
Investing Articles

GSK’s share price is under £22, but with a ‘fair value’ much higher, is it time for me to buy more right now? 

GSK’s share price rose over the last year, but a huge gap remains between its price and fair value —…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

Here’s how investors can aim for £11,363 a year in passive income from £20,000 in this overlooked FTSE media gem

I think this media stock is commonly overlooked by investors looking for high passive income, but it shouldn’t be, given…

Read more »

Tesla car at super charger station
Investing Articles

Why is Tesla stock down 30% since late 2025?

Tesla stock has been a bit of a car crash in 2026. Edward Sheldon looks at what’s going on, and…

Read more »

UK supporters with flag
Investing Articles

Is Wise now the UK stock market’s top growth share?

Wise rose around 4% in the UK stock market yesterday, bringing its four-year gain to 135%. Why are investors warming…

Read more »

Warhammer World gathering
Investing Articles

£20,000 invested in this FTSE 100 stock 10 years ago is now worth this astonishing amount…

This FTSE 100 stock's delivered an amazing return over the past 10 years. James Beard considers whether it’s worth holding…

Read more »