Being obsessed about the possibility of loss will and does hold you back.
You WILL lose some money in the process of running your trading business,those losses are a cost of doing business.
There is much to the process but there are basically 3 ways of making a consistant profit.
(1) Win more often than you lose. (if position sizes are the same).
(2) Have far bigger winners than losers.
(3) A combination of both---although each can be profitable on their own.
Really my advice would be to actually understand the mechanics of being profitable within a trading business,until you understand the principals behind running a profitable trading business your segmented in your approach.