I and some of my friends had the same ailment. I overcame him at the age of 14 during the first good fight. But my friend, even at 21, cannot hit another person. As the green street hooligans said: "I realized that I was not made of glass." And after that, stop being afraid to take a hit. Then you just need to have your own principles, beliefs, for which you are ready to stand to death. For example, for a family or the fact that the earth is flat😅. I don’t want to resort to sexism, but such is the man’s share - to wave fists. If you don’t need to defend your convictions or you don’t need to defend someone, then there’s no need to beat.
Of course, negotiations are better than fighting
If a person is violent towards another person, this does not mean courage. And if you lack self-defense skills, then you should visit the martial arts section.