Well I'm stuck because my breast are devlopping and I have a school trip very soon and I need a bathing suit. So I told my mom to get me some since my old ones are too small on the upper part. So my mom got me some but my boobs pop out of them so I don't know what to do and I still don't wear a bra I am soooo shy please help. And should I wear a padded bra and bathing suit. Because my mom will never relize that I need a bra but we live far from
The city (40 min). How do I tell her I know its time but she doesn't know that.

Make the trip with your mom to look for a swimsuit that your comfortable with. You can try a few on if that is what it takes. And maybe while your in the store drop by the section that has bras and show your mom ones you might like and ask what she thinks or how one should fit properly.

Make a day of it and have fun. What your going through is normal.

A padded bra under a bathing suit that doesn't fit properly, won't work. Instead of your breasts popping out, the bra will. If the suit won't cover your breasts, it won't cover a bra. No suit will.

Ask your mom to take a look at the suits she bought you. Show her that your breasts are exposed in those suits. You must be old enough that she would realize that having your breasts exposed, even if they're not developed, would be bad.

There are suits that have padding in them that hide budding breasts. Those are an option. Wearing a padded bra is only done to try to enhance what you don't have. At this point hiding what you're starting to have, is the best course of action.

Mom is a woman too. Just talk to her, tell her you're embarrassed because you're starting to develop. You likely would feel better with a training bra, and that's no big deal. Many girls get them long before they even start developing enough to need one. Mom should understand. She probably hasn't mentioned it, or thought of it, because your development isn't noticeable yet.