Well it depends on what "looking like myself" is. R u girly, a tomboy, gothic? If I went to that school I would wear really cool, funky accessories(try Claire's or claires.com) like huge earrings and bracelets and really long necklaces. @ my school we have to wear ID badges and instead of putting my badge on the ugly lanyard they give everyone, I clip it to my shirt, purse, or wear it with a necklace that matches my outfit.
If u r "gothic", why not add a chain to your skirt, wear one of those spiky bracelets, or wear a black collared shirt? Try: Hot topic
Tomboy? I'd suggest just going casual. Try: basically any store. I like Old Navy
Girly girls should go with pink accessories, lace cami under your collared shirt, and flip flops
For everyone: cool belts, layered shirts, funky skirts, cool hairstyles. Hope i helped!