Do i need a bra? When did you get yours?

Im elevens, I did start developing breasts 2 years ago but slowly. All of my friends have crop tops and singlets with hidden support. Im about to turn twelves. When i run my breasts do bounce, but i dont run much and its nit like the boys are all staring to check if they bounce. Does it made a difference if i have a crop top or whatever? Like, do you think it is essential? When did you get ur first crop top or bra? Mum usually gives brass or crop tops for peoples 13th birthday but my sisters didn't have as big breasts as me. This sounds odd. Anyway, it would be sooo awkward and weird to ask my mum. Most of my friends mums just came home with them but 2 of my friends were like; 'mum, i need a crop top, pronto!' what do you think?