How do you deal with insecurity in the gym?

I really like working out and I want to go to the gym more but I always feel really insecure because everyone around me knows what they are doing and when I go to the gym sometimes it takes me a while to get into the sense of things so I will just wander around about and I always feel like I look really stupid doing that. Also, I feel really awkward sweating in front of other people and I sweat a lot so I feel like a lot of people will judge me or think it's gross. Lastly, I have pretty bad eyesight so any time I do anything physical I've always worn sports glasses, even when I was younger and more athletic. I could never use contacts and I don't wear normal glasses because I do not want them to break. Do you know of anyone who wears sports glasses in the gym and what do people around them think? Are they noticed a lot?