Pretty much in the same situation, but don't have the weight issue. I have been to a couple of r/LondonSocialClub/ meet ups. It's hard to make any friends. But even in normal life to find a good friend is hard.

Are you male or female? You can't let the fear control you, just jump into these situations and see what happens, the Reddit meet ups are good for this. You don't even have to speak, there were guys at the one I went to who hardly spoke, but obviously it helps if you do.

If you wanted to, we could even do a small meet up, four or five people, you have to remember we don't know each other, so what is the worst that can happen. If we don't like each other we leave and never see anyone again.

First thing I would recommend, cancel Netflix, stop buying the junk food, and start going for a short run every other day. Even if it's just 10 minutes. The longer you leave it, the harder it will be. If you find yourself sitting in all day, do something, hop on a tube train and go to the end of the line, have a walk around when you get there. I know it might sound stupid, but that sort of thing really did help me, just being out and around even if it's not for a reason, helps.

If you don't mind, which country are you from? does anyone at your job every go out?