How do I make a fresh start for myself?

it's the start of a new semester at my high school and i want to start fresh. i'm 16 and i've never had a boyfriend. I feel like my skin color, my small-ish ehem "assets", and most importantly my closed off demeanor are what's holding me back from being able to date who i like and from boys liking me. obviously there's not much i can do about the forst two things and i know i shouldn't feel that way about my skin (i'm half white half black) but it's very true. what can i so to get guys more interested> i'm not looking for brilliant answer just a little advice? thanks :)