How do I ask my mom a question?

Okay, here is the situation I am in. I am 13 and have anxiety, I had to get out of athletics last year because all of the stress. I got back into athletics this year and it is even worse, I just don't want my parents to get mad at me or kids to make fun of me like they did last year. I am in the car with my mom only and we are going to my great aunts house because we don't have school tomorrow, so how should I ask her to get out?