That jealousy goes both ways. I often wish I was one of those people who can share stories about their adventures into many interests, or who can relate to a wide range of people because of their variety of experiences. Going deep can be very isolating. Unless my conversation partner happens to have some overlap with my limited interests, I'm at a loss. Too many conversations end with the other person staring at me like I came from another planet :(
Have some of this as well, what helps me is picking up tangential hobbies where some skills may carry over(or vice versa). I would say tennis is my main hobby, and recently I have started playing a little bit of pickleball and racquetball to get variety. The skills and tactics for tennis are pretty different from the other two, but having things like hand eye coordination and footwork carry over are a big plus! Conversely I picked up 3d printing last year with the intent of learning to 3d model, and I felt like a pretty big noob trying to figure it out. At the end I just resorted to printing what others had already modeled haha.
(Software engineering and running are probably the ones I've sustained for the longest, though kids haven't helped with the latter.)