Need advice

Need help with anxiety and overthinking. I joined our highschool inter school basketball team and sometimes we practice with our opponents and esch practice we usually play games and in those games i can't think straight and im usually scared instead of just trying to enjoy the experience im also not that good but i know a thing or two but when i go on the court i get scared by the other players because there big some are tall and they have skill and i can't stop but overthink or become nervous when theres practice and i really need help my mother and coach told me advices it helped but i still can't shake the nervous anxiety and overthinking.After this experience im not that interested in basketball idk tho.