My breat hurts! I don’t know if it’s because I wore my sports bra too tight. IS IT CANCER?!

Oh shit I am going to die!!!! It’s been hurting on and off! I’m 19 I can’t have cancer!!! I AM GOING TO DIE! WOMEN HELP! I can’t die and I’m too scared to go to the doctor and it’s that pandemic.
I did a self exam and I have no bump. HELP! IS IT CANCER?!