First of all, I think everyone feels atleast a little self conscious about themselves and about their boyfriends, so it's natural. I think you need to talk to your boyfriend about how you feel; if he assured you that he liked you and would rather be with you than some other girl, you might feel better? Don't cut yourself, because you DONT deserve to be punished or anything. Don't take your brother's pills because it could have a negative effect on you. Ask a psychiatrist or schedule an appointment with someone and tell them about how you feel if you think it's really serious or it gets worse. Be happy with your size, and remind yourself everyday that almost every woman in the world would trade their size D boobs to have a petite figure Good luck and think happy thoughts!