re: What hobbies do you do by yourself?

Video games, cook, binge watch tv, watch documentaries on history, science, economics, conspiracy theories, etc.

I also play music a lot. Granted, I also perform in bands, so a lot of it is practice for live shows or writing songs for that I intend to perform, but much of the playing is for me. It gives me a creative outlet that I don’t really get in my everyday life.