I think the treadmill sounds terrible as well, but maybe be open to the possibility that you would enjoy some if fitter and thinner. I’ve been strong and fit and I’ve been pretty overweight. The state affects what you perceive as enjoyable.
Try riding, maybe with an e-bike. Gets you out there in a similar way to hiking. Do it with friends or not. If you get vaguely hooked it gives you a new way to explore areas. Even if not that, please don’t give up on the idea that maybe you’d enjoy a sport if it didn’t suck. It’ll suck a lot less when you’re 10kg lighter. Two weeks of changed patterns and I’d guess you might feel differently.
I’m currently overweight and just took up a new sport to make exercise more fun. I ride and sometimes run, but no upper body. So started BJJ to get some form, suppleness, technique, social fun with friends. I’m not there yet but I can’t wait to feel a bit stronger again.
Have you ever been fit/strong? Friends who haven’t often just hit that initial annoyance or pain and quit. I have been fit so I know that feeling is just temporary and it doesn’t take long to fix.