Gaming
Gardening
Hiking
3d printing
Woodworking
Reading

Creating/writing/producing music, playing somewhat chill MMO games (often solo), walking/hiking in nature/interesting urban areas I haven’t fully explored before. Drinking a beer in late afternoon while sitting out in nature, just letting my thoughts run free and enjoying life (if that counts as hobby, or just an activity I do most days). Those all get me pretty far and never drain me like extroversion activities do.

This is going to sound a little strange, but playing music on stage works for me. At least in moderation, and provided you aren’t the lead singer/MC who has to interact with people. You just wanna be some guy in the corner jamming on whatever you jam on.

You kind of get the best parts of being in a social situation in terms of seeing new places, having interesting experiences you can ponder for days to come, and occasionally getting free food and/or a green room where you can veg out in isolation and no one expects anything of you. But you can avoid the negatives: having to make small talk, looking awkward with nothing to do and no role to play, being labelled antisocial, getting roped into some horrible activity you did not sign on for, etc.

And it turns out there are a lot of introverted musicians. You only really need one extravert in a band.

Climbing/bouldering at a bouldering gym, its sociable but since its often a solo sport you can leave any time.
Also every climber I’ve come across is very chill, and its good exercise.

Running.

Programming (python), making music/learning instruments and synths.

This is going to go against what a lot of people will tell you, but my thought is that you should try to challenge yourself to be social and learn to develop those skills, rather than continuing to develop antisocial skills in your comfort zone. To that end, I’ll suggest you look into things like Toastmasters or another public speaking club, and tabletop RPGs - in person, not on Discord. You will have to overcome the challenges of being social and learning at the same time, but I think that those would be valuable experiences for you. Local boardgame groups will also be helpful, as you’ll be able to focus on the game rather than the socializing.

Everyone needs to learn how to be social. Don’t hide from it.