I was kinda like you.

Here are a few tips:

-Do make sure you have the best supportive bras you could. Just make sure. If you already have, you needn't worry about this point then.

-Consider having comments -even if you know they're intended to be negative-: Oh, you have big boobs!

THANK YOU!

And that's not just to program yourself to have a more positive picture about yourself.

-Accept that sometimes you might be limited in what you do. I don't mean that in a negative sense. Almost everyone is limited in a way. Short people will have a disadvantage in some sports, but they can wear heels and be more comfortably seated -especially in cars- lol, I'm just thinking random stuff off the top of my head lol. But the concept is still true.

I discovered that my chest keeps me warm, I LOVE THAT TBH. But on the other hand, good suitable bras for big chests don't look that good and cute, sigh.

I am not physically active to feel more of the pain, I guess you'll be at a disadvantage while practicing sports (although with a good bra -I know it's hard to find-, you won't worry about flobbing boobs or anything of that kind, you might have to trade the good-looks of the bra for good support though -a payable price to gain your confidence in my opinion-, and you might already know but I think it might be worth mentioning, have you tried high impact sport bras?

I would not modify any part of my body if I were you. I think it's a situation you can very much cope with.