Going into a new school for senior year?

Show confidence even though you don't seem to be very confident going to this school.. There's nothing more unattractive then a shy new girl. Try to join some clubs or something so that you can meet people. And your right about that fact that sense your a senior everyone is kind of in their own group.. But just be friendly to everyone and show confidence and about the guys just make sure not to step on other girls toes.. Make sure you don't like flirt or something with a guy that you have a feeling another girl likes.. That is usually a HUGE problem for boy girl schools. Also try and get a campus tour or just go to the school if it's not locked or indoor or something like that a few days before school starts so you don't end up losing your way around school!