I'm always hot and sweaty in shorts and a t shirt when everyone else is totally comfortable in jeans and long sleeves. What's up?

Im not over weight I'm 15 years old never in the hospital never had any kinds of health problems but I find when I'm in class just sitting there on a casual day I'll be sweating and feel hot. I'll turn to the girl next to me wearing tights and a sweater and she's perfectly comfortable. This happens throughout the day everyday. It's annoying cause I tend to try and avoid jeans and sweaters even in the winter and I try to only wear dark clothes to hide my sweat stains. What's up with me?
I'm always hot and sweaty in shorts and a t shirt when everyone else is totally comfortable in jeans and long sleeves. What's up?
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