you are very correct
THAT'S WHY you have to apply :
1. Money management (must be number ONE)
2. Discipline (about your own rules... so if you don't respect yourself then who will Lol)
3. have (/borrow) a system ( then see point nr 2 ! Lol)
4. Be consistent EVEN IF YOU LOSE SOME TRADES
5. have sufficient capital , especially to be able to implement point nr 1 (i.e. to be able to average down to a next support level)
(don't overtrade and don't force trades, and don't chase , and don't smoke hopium, all fall under point nr 2)
It's not easy, otherwise all would do it, so don't beat yourself down, but we can make it easier