Not a normal muslim teen? no bra? no shave? 16 yrs.?

Ok, well you definitely need to talk to your mom. At 16, you have to wear a bra regardless of your size. Especially in gym cl. When you are running, it is unhealthy to not wear a sports bra. Also, it is good hygiene to shave your underarms and legs. If you explain this to your mom, she might understand.