My bestie acts so weird?

First are you also a female or are you a male? If your male, maybe find guys to hang out with as well as no one in High School is truly ever really ready for a mature romance, not saying that it isn't love, but I always felt if it was meant to be it will happen. If your Female, find new friends, Friends don't treat Friends like outsiders ever. A true friend will stick by your side no matter what and not make you feel left out. I have alot of friends from High School and We are still friends after 23 years. Not once did they make me feel like I didn't belong. Nor did I make them feel that way. and When I say alot of friends its the range of 50-100,some from the same grade as me, some were a grade ahead, and some a grade below. Don't ever let anyone make you feel unwelcome, if thats the case they are not your true friend.