im 19 and have receding hairline, what can I do?

I'm 19 and I doubt the hairline is caused by genetics, my dad doesnt really have one, one of my brothers is overweight but doesn't have one so I'm not sure if I'm having a lack of something or cuz his dad (different dad) hasnt got one either. Or maybe my weight is taking more of a toll on me. It stresses me out and it can cause problems social and self confidence wise with girls and feeling good about myself. I'm currently training going gym 3-4 days a week plus maybe physically activities like Playing football and going out and walking. And I want to avoid supplements because I don't want to risk the side effects they probably have which is why I stopped consuming protein shakes any help will be much appreciated