How are you supposed to get better at a combat sport if people at your gym are 100x better?

You join a mma, boxing or brazilian jiu jitsu gym. Its your first day , you walk in and get to know everyone and realize everyone is 10000x better.

Going forward, if everyone is more skilled, experienced and even stronger than you, how will that help your case? In sparring theyd just keep beating you?

I want to join a martial arts gym but this is my exact fear.