im 17 years old with low self esteem

I'm 17 years old.. I have a boyfriend who I love.. We've been going out for over a year now and he makes me feel like the best girl in the world.. My problem is my self esteem is not very good.. and on top I'm getting braces.. I'm gonna go through my senior year (something I've been waiting for a long time) & and when I found out I needed them I freaked out.. Unfortunately I do care what other people think and the only reason why I feel a little pretty is because of what other guys or my boyfriend tell me.. I know with braces I'm going to look different.. I'm scared of what my boyfriend might think..and his whole scenario of his "perfect girlfriend" will go down...