I feel as if no one cares

Except from family , I feel people at school don't care. That they are just classmates and don't really want me. Why are some good advices for this other than "just be yourself." I don't feel as if "focus on yourself" will help because I wanna. Connection that I can't really get. I feel invisible. I also feel as if I did soemthjgn wring people will be quick to hate kn me like if I performed bat in school football.