What should I work on to get a girlfriend in high school? might be long...?

I won't be starting school until September, but I'd at least like to know ahead of time. I'll just explain to you guys a little bit about who I am. I'm tall for my age (6 foot), kinda chubby but I'm getting better with that. My grades are OK, not bad but could always be better (my average would probably be a B) and quite frankly I'm ugly. Acne is a *****, that's all I'm gonna say. I'm not really limited to one group of people, normally I'm a bit of a wanderer. However, I am very quiet. I'm one of those "only-talks-when-necessary" people. It's a mix of an obsession and a hobby, but I like music. I'm always either listening to it, or playing it (guitar is one instrument among many), and I've been told I'm good. I play most everything, but I'm best at finger-style things (I've been playing for 3 years and never used a pick before, never needed to or wanted too). Also, I have about as much confidence as Eeyore from Poo-bear, so I don't know what my goods points would be. Any help would be appreciated and thanks for reading through the whole thing :)