Trading is like spirituality or even games. it's mean there is not single truth so you have to find your own truth & believing in your own experience . for example if your temper is like kohli then you will act like kohli in frustration or your temper is like Dravid then you behave like it. what's your own personality follow and improve that.
Secondly self-doubt is good thing , simply it is telling you now to improve in that direction it may math, statistics, behavior, knowledge etc. which last mistake/s push you in self doubt hell ,is it higher loss or higher leverage, unfamiliar pair or instrument or small quick profit , or little bit gambling attitude or feeling like you are the market maker and know everything trade etc find that and improve.
For emotional just accept it that we have emotion , we are human. you have to give some credit to Luck specially in trading. it may be controversial or even wrong but you have to do it. small portion of Luck will apply to both your profit and your loss.