my mom wont let me not wear a bra.

okay, so I have had an on going conversation about this with my mom. I have b cup boobs and I hate bras with a passion. they make me feel insecure fat, and uncomfortable. I want to go places without one. I understand when it's totally inappropriate and I'm happy to put one on in those situations, but like she makes me put one on when people come to our house (people I'm close to like my best friend or SISTER or even my brother)and d she makes me put one on for grocery stores, g as stations, clothing stores, etc. I feel like it is not her place to tell me what to do with my body oor wear. I'm not a child. its starting to make me feel like I should be ashamed of having boobs. what do you think? please by kind, harsh words are unnecessary.