If you assimilate, no one will know what kind of person you are AND you will feel weird and untrue to yourself.
Even if it’s uncomfortable at first, it is better to be yourself, especially in situations where you’re going to be meeting new people. Better that they know what kind of person you are right off the bat.
Social pressures in high school are such bullshit. Young people often want to fit in, to be the same as everyone else, and those skills really aren’t very useful in the real world. You will get more out of life if you can stick to your guns and be you.