Your life, your head, none of their business...............
Welcome to the Forum Dude.
you owe nobody an explanation, you were a smart man for going bald
Carl, all this confidence at 21? Fantastic.
Im 20 mate and to be honest let them say what they want, as they will have got used to it with a week or two

If they decide to keep at it, reverse the situation and just say that you look better than them lol
Just be confident mate and act cool about it, don't treat being sly as anything different, when i shaved mine the other week, i told no-one in my family or friends, i just went to their house as usual and they had their shock and now they don't even say anything.
You shaved your head because
you wanted to, that's it and that's all.
No one needs an explanation.
Welcome to SBG's forum Carl, now get out there and enjoy your smooth dome, stand tall and proud.
I guess it would just be "piling on", but the only explanation they really deserve is that you did it because you felt like it.
I just say I was loosing it so I shaved it off.. I find it theraputic, actually. I've tried "oh, I'm trying something different.." but I find that the questions keep coming. I have been trying to hide my balding head for a while, and my stomach would sink if someone brought up a topic about hair. I'm only a few years older than you... Say whatever you want as long as your confident about it.
When I got my first proper head shave back in 2003 I was receding quite a bit & my hair was thinning out. I went for a haircut as per normal & usually had my haircut fairly short (normally a #2 blade all over). My barber started cutting my hair & suddenly suggested that I have my head shaved as he reckoned that there wouldn't be a huge difference between a #2 & razor shaved on me. I reluctantly agreed. Boy, what a difference.
When folks seen my bald head & asked me why, I simply said that it was my choice.
Don't make any excuses, mate. Be proud of your shaved head. At least you had the guts to have your head shaved instead of putting up with a "mess".
I'm almost tempted to do a reverse 30 days and let my hair grow out for 30 day. Then when I'm done, I'll take a picture and keep it in my wallet. That way when someone ask, I'll just pull out the picture.
No, you say: "It's what I chose to do, because I like it" Simple.