It won't go away. Especially at 22. You will be lucky if it does. I got it at 12. The doctor said it would eventually go away once puberty was over. It never did. It's not full on tits but it has always bothered me to wear t shirts. I'm 52 now and just had to get used to wearing certain types of shirts that don't accentuate it. And I've always been slim.Nobody knows?
If it isn't gone in a year, surgery is the only hope. Even then it usually comes back