Not only do I see a lot of posts here on this topic, but it is also one of the main statements my friends give me when asking for tips to "get into shape". My immediate response to them has now become what I put in the title of this post.
I go to a gym with about 3000 members, probably the biggest one in my city. This particular gym has this stigma for being roid central, as it houses quite a few pro bodybuilders and high end Instagram models, mixed with power-lifters who've been pumping iron since they could walk. Stepping foot inside the building can be a very daunting thing for newcomers as they feel they're immediately placed at the bottom of the ladder.
Here's the thing though, something that is one of my favorite aspects of joining a gym. Despite what is taught outside the gym walls, once you walk inside, 99.9% of the time no one could care less about your size, muscle build, appearance, or the level of progress you are at. The only people that will give a shit about you are personal trainers, and that's only because they're paid to. In fact, the only point where most regulars would acknowledge your existence would be their first glance at you, and most of the the time this will consist of them thinking "Good for them, good to see people trying to improve themselves," before they get back to whatever they were training.
Remember, everyone in a gym shares a common goal: to improve their fitness. Most are too focused on this goal to even consider for two seconds if you are sharing that goal with them.