Interesting! My main suggestion is to chat with your math teacher about this (my apologies for the redundancy if you have already done that). I'm sure they will be very happy to hear that you are so interested, and they will probably have suggestions for ways you can pursue that.

There do exist groups for students interested in math to get together, e.g. https://www.nymathcircle.org/

https://momath.org/jobs/#volunteers

https://momath.org/home/unlimited/

I'm sure there are other possibilities too, which your math teacher might know. It would be good to be able to hang out in person with same-age peers with similar interests. They definitely exist!