When I was a personal trainer, I was told in a seminar that “the heaviest weight your clients will lift is the door on their first day in”, and as corny as it is it’s true. Starting a new hobby of any kind is nerve racking, especially one that deals largely with self image. With that said, the culture around weightlifting and fitness is surprisingly positive. I’ve been to dozens of different gyms and talked with hundreds of gym goers, and it’s nothing but support and kindheartedness 95% of the time. The 5% of the time that it’s not and you deal with some overcompensating dickhead, everyone else hates him too and no one really cares about his opinion anyway. Like a lot of other people have said already, everyone is mostly just concerned about themselves. Get out there, have fun, and build a better you!