Is it true that if you build chest muscles your breast size will increase?? My friend has big boobs and a big butt. But NOBODY in her family has boobs or a big butt. She has been on a swim team for seven years and I think I could just be muscles. Maybe?

She could take after a grandmother or someone even farther back in her family tree. I'm sure there are muscles there, but there's certainly more to the story (i.e. inherited traits).

Well should I be upset that mine are not as big as hers and I NEVER get any attention from guys because of her?

I
s it true that if you build chest muscles your breast size will increase??
NO!

You're a kid ,you have yet to develop.I know how old you are ,who cares I am really flat and always have been.
My boobs don't make me who I am. They don't make you who you are either.
You have sooo many other attributes :)

:D feel much better :D

:D feel much better :D

You are so funny and sweet! ;)

:D feel much better :D
Think about it. You can wear lots more styles of clothing than she can and you will look REALLY good -- stripes around instead of vertical, large floral prints, light colors and white. She will have to spend more for clothes, especially if she gains weight. When she's older, her breasts will begin to sag; I've seen old women whose formerly-large breasts literally hang down to their waist.

Don't ever compare yourself to someone else. Set your own reasonable expectations for yourself. Why would you want the attention of a guy that just wants to stare at your boobs and butt anyway? Wouldn't you rather date a guy that looks into your eyes when you talk, listens, and converses with you?