Well, it seems that I had a much different experience with high school than the rest of the commenters and I will provide my take on high school because it is always good to see the whole spectrum.

I was much more of a "jock" stereotype, but I was also in all AP/Honors classes so people thought of me differently. I have a very fluid personality and would move between groups depending on my setting. I wasn't faking anything, I just could relate to all different people and there is no point in isolating yourself just because of what is "cool". I brought together the true jocks who were terrible at school and the honors kids who weren't into sports. Our lunch table was one big social Venn diagram.

I honestly had a really good experience in high school which I know is not the same for everyone. I always tried to boost the morale of some people who really didn't like the social dynamics of high school. I had a very close relationship with one of my teachers who became a dean and had me as a student aide. Me and him had a group of fellow students and teachers who tried to limit any bullying and bring people into his office to hang out and escape for awhile during bad days.

I've seen the quietest kids blow up and freak out because they are constantly disrespected by assholes. It will sound super cliche, but just be yourself. There is no point in trying to make friends based off of a false personality. Join a variety of different clubs so you can meet more people and get engaged. I played soccer and baseball all throughout high school and it definitely helps for confidence and making friendships.

Good luck with the sophomore year.