I'm insecure around my BEST friend?

Don't worry about her, you'll look a lot different from when you do now. It's not about what you have now, it's about what you have in store. Those who are popular now in highschool aren't always the successful ones in life. You are an individual and thats whats important, people who judge based on appearance are shallow and not the kind of people you should associate with. Cliche, I know, but it's true.