Wow, i know how you feel!
Here's a fact:
Ladies who get to be about 50yrs old or so, stop their periods, my mom just stopped hers, and she's 52. My sis is 17 and she has hers so i don't feel felt out or anything like that. :) I started mine when i was 11, now i've had it for 3yrs. Sometimes it's okay to feel like how you're feeling rn. I know it might not seem fair but all of life ISN'T fair.