You should join MvF Leyton, mate! Great group of lads over here and the new season starts towards the end of January!
As for gyms, put your headphones in and look at the machine/TV. The less you look at others, who mostly won’t care about you being there, the less you’ll notice if they look at you.
The more you concern yourself with how others perceive you, the longer it’ll take for you to actually do something about your weight and the more it’ll manifest in your mind.
I think @choco_bear_strem is joining a gym in Hackney soon, he might be able to help you out. He’s also on my team in Leyton, top lad!