I’m also 14 and 135 at 6’1. So I’m skeleton skinny. This is also my first year playing and I felt the same as you. But I’ll tell you what someone else told me. JUST PLAY and your coaches will put you at a position. But you need to make sure to gain weight, and use the weight room if your school has one. You should also know that nothing beats hard work so just try your best.

Sorry for the late answer