Fashion advice pronto 911 fashion police?

well my friends always dress a little better than me and i don't like it cause i have a flat chest and so it it kinda hard to get something that is really pretty on to empress people and i want to look good and my fashion is horrible to me and i don't know what to do everyone laughs at me and picks on me .my mom says that i look awesome but everyone knows if your mom says you look good that means you have to go and change again so please someone with some fashion sense help me please please please