I seriously believe that trading is 90% psychological.
I used to be of exactly the same opinion when I started out (and for some considerable time after that) however I now agree with Euan Sinclair's thoughts on the matter. He stated 'I know of no other field of endeavor where failure to perform a skill is routinely blamed on psychology. Would you seriously listen to a basketball coach who told you that the
main reason you are not in the NBA is was your lack of discipline and desire. While great players are psychologically strong, no amount of desire and resolve will turn you into a professional level player. The reason professional traders make money is because they are playing a totally different game'
If I was into conspiracy theories I would say that this psychology myth is peddled by the industry (including vendors) to keep you in the game and keep you trading. They want people to continue playing the flat directional (delta) game as that is how they get paid.
You should also consider that professional poker players know that the single most important factor in profitability is game selection. If you are at a weak table and a reasonably competent player then you are likely to be profitable.
So what other games can you select? There are a whole host of games where you take out the directional component. i.e. you are delta neutral. Here are 3 examples:
(i) trade people's over excitement. go long volatility into an earnings release, flat into the number. short volatility when the number comes out in line. model which trades are more likely to have more excitement, when excitement (mispricing) starts and ends.
(ii) use stat arb relationships - create highly mean reverting spreads. i wrote about one in some earlier posts.
(iii) market making - capture directional order flow and hedge as you go - complex but doable. This company provide market making training
For the most part professional traders carefully select their games. Yes they develop strong psychology but imo this is not the
main reason they succeed.
I am not stating here that directional trading strategies such as the momentum strategy used by the OP. I am saying that when I see psychology being cited I often think game selection couple with reasonable competency in that game would provide better outcomes.
Good Luck.