Who should I be friends with?

I get along with a lot of people although, sometimes I can be shy. High school is starting soon. I have different friends that are in different groups. I am trying to not be friends with one girl at all anymore. Also, my mom doesn’t want me sitting with my old friends. Most of the popular girls are basic and copy each other and don’t have an individuality and I don’t want to be friends with them because of that. My mom doesn’t want me to be “unaccepted” or an “outcast” so she is implying that she wants to be be relatively popular I guess. I know that I should be myself and express who I am and have friends that are similar to me. I play club soccer and plan to play for the high school this year. Who did I sit with at lunch and who should I be friends with? Please help.