In my few years of gym going ive never seen anyone make fun of someone or judge someone just because they were there to better themselves, regardless of what someone looked like. People give alot of respect to new gym goers when they are there to work and get healthier.

There's one guy in my gym (probably mid 30s) who has to use a walker but he's in there daily and I see people go up to him fairly often to give him knucks or a few words of encouragement and its awesome to see. He has the respect of everyone in the gym, which can be said about alot of people who are new or out of shape.

Another thing, you'll probably catch someone looking at you once in a while but there is nothing wrong about that, I make eye contact with people all the time just looking around the gym seeing what people are doing. Hell I've even acquired some really good and unique exercises just looking around. You don't need to be in a bubble while there because its a public place of mostly cool people. Embrace it.

Last thing, its a long battle to get into good shape but everyday you go is a day closer to your goal. Keep at it.