So these girls may or may not like you... just hang out with them when school starts and take it from there. Concentrating *too much* on the opposite sex merely detracts from the more important things and can end up making you go crazy and be all kinds of stressed-out.

Besides, girls have a tendency to be really friendly with guys who they perceive to be just friends - it's the whole emotional-level-contact-thing going on. :P