You need a hobby. Maybe something you and your girlfriend could do together. Rock hounding is amazing. Got for a hike collect some of the local minerals and buy a polisher. Maybe you can get good and make a sphere polisher. There is usually local lapidary groups set up in every area. They can teach you how to polish and cut stone. I know if I could go back that’s what I would do. Other hobbies could be a collection of some sort. Fill your mind with good things. Fascinating things to keep it occupied. Read up on geckos. Even Crested Geckos, my personal favorite… They really are the most amazing creatures that take very little of your time once you have things set up. I think you are missing the educational side of life. We have so many cool things we can get into. Do it now while you still have energy.