Im 21 and in a really happy relationship but i have zero friends. why? i want to know how common this is!?

you sound like a really cool person and i get what your saying. when i was in school i had tons of friends but people go through their younger years watching each others backs but then we grow up and grow apart living our lives for ourselves we lose touch with the people that we spent so much time watching out for.its life and its completely normal.sometimes theres a few that we stay in touch with but not always.don't listen to people that make you feel like your the only one with that problem cuz it is normal its just a part of life.i'm glad that you have such an amazing bf cuz some people aren't that lucky.put yourself out there a lil and you would be surprised what you find..join the gym take up a hobby but don't be afraid to try whats the worst that can happen..and if ya ever wanna chat i have no problems with that. i hope this helped and good luck..