17 year old scared of breast cancer

i am BEYOND terrified of the thought of having breast cancer. i suffer extreme health anxiety and have convinced myself that i have breast cancer for years. im only 17 years old so i know the chances are extremly slim but living with health anxiety, your mind makes you go crazy. i havent noticed any lumps but there is an very very tiny what i think is a cyst, about the size of a dipping dot ice cream or smaller. ive had it for plenty of years and have not been concerned over it because it has not grown and it is moveable. but recently ive been having left sided upper rib pain on my side (may be due to period soon to come) but i immediatly associate that rib pain to cancer and im going crazy. i just want to be okay. could it be because im very tense all the time?

listen son you are only 17 years old and plz dont scare yourself u r so young its impossible for u to have that disease in this incredibly young age relax and stay away from google ik you are having an health anxiety relax man

she’s a woman