how to have confidence and stop thinking so much ?

i am playing winter indoor games for both my high school team and my club team right now, and i always find i have so much more confidence when playing club. i’m more calm with the ball, take more risks, better passing, and i don’t let my mistakes get to me much. in high school games, however, i just feel more tense playing, and my confidence is low and i find i think too much about what im supposed to do when i receive the ball or dribble, where as in club i just do it without thinking really.

none of these winter games really hold any weight and they are more just to get in shape, so i know i shouldn’t stress over them but i still do. i feel like on my club team my teamates know i am good, so then i feel like i am a good player, and so then i play well. but in high school i don’t have the same mentality because i cant play to the same ability due to lack of confidence.

i was also way out of shape my freshman year and ended up getting cut, but have improved significantly since then, yet i just feel like i constantly am having to prove myself so i don’t seem like someone who would get cut.

long story short i just don’t want my mistakes to sting the way they do and i want to have the confidence to carry the ball and play well, like how i do in club.

thanks!