Psychology and investing (2)

Since last may, I made so many mistakes that I would have saved a lot of money just by doing nothing.
And I'm convinced a large part of these losses come from psychology.
Of course, bad luck and bad judgement also play a part.
But basically, this is the stress and the instability of opinion tha create all these losses.
Investing is really not that complicated. But you need to do it with serenity.
Right now I am convinced that I should simply stop.
But even this decision should not be rushed.
It's just that the pressure I am under is increasing.
I need to build confidence back gradually, by making a good decision at least once. Even if it does not make that much money.