Need gk tips for high school

I’m 15 and weigh about 132 pounds and I love being a goalkeeper. I’m in my freshman year and I’m thinking on trying out for the high school soccer team. Most of my friends are already there and I really want to join. However, I’m afraid that I’m too “weak” for my age to be a gk. I’m about 5’10 and look really skinny, but I’ve done well as a gk in the past. I was hoping I could get some tips on preparing for the tryouts and what I should do physically. I would appreciate the advice.