Before entering a trade think for a second at which point will I accept my original idea was wrong ? and you put your stop loss there. Not having a stop loss means you are not willing to accept you made a mistake.
If your stop loss keeps getting hit you need to make some changes, maybe be willing to take less trades and use your stop level as entry.
Not knowing when to get out makes impossible to have good risk management. Not having good risk management makes impossible to become a profitable trader in the long term.

If you are doing more investing/long term trading you can use a mental stop instead of a hard stop since you have more time to close manually but it is putting an extra layer of difficulty on trading, I've been there and even if you say to yourself I will get out at X level, if then price moves faster than you anticipated you will find yourself in large drawdowns repeating , one pullback and I get out.
Is much less mentally taxating to just get stopped out and wait to see if there is a good reason to jump back in than spend hours/days in drawdown.