I was 18 when I started going bald. I really noticed it at 20 and panicked and started taking Propecia, which really slowed down the loss but it still kept slowly falling out. Kept taking Propecia for 5 years. Then about 6 months ago, saw a photo of the back of my head and realised how bald I actually was. So I gave up at this point, stopped taking propecia and got a number 2 all over. It doesnt bother me anymore.
I read somewhere that 75% of all men go bald in their lifetimes, just some start earlier than others. And also, the kind of person that judges someone for being bald, probably isnt worth being friends with anyway. In a way, it can protect you from people like that.