The tl;dr is: Just hold on. It gets better. Much better.
The bad news: You've probably got a good case of ADHD, coupled with mild depression, the usual existential angst, all made worse by a huge impending transition. The "tools" you're building (I was building) were really giant abstraction layers between myself and "the real world" (if that makes any sense). I'd start out with a specific purpose of course, but falter as the scope expanded until I was trying to encapsulate all of reality (or possibility?). I'd get excited when I'd discover parallels between the projects I'd started and excitedly think to myself "wow, when I get this thing done its going to do everything! Its a whole new way to see the entire creative space!" Really they were just all running together like melting crayons in the global namespace of possibility. What you're feeling about these projects is inexperience. I know it doesn't seem like it, but it will looking back.
The hard realization was that the stuff in my head just couldn't be expressed by any real world media, even of my own design. Reality sucks like that. Worse, I only had so much energy in a day, and only so many days to live. If I had 10 lives I still couldn't explore half of what I already wanted to. The worst of all? Lots of people felt just like I did. They were better at most things than I was too. I was no-one special.
The good news: I think you'll probably just outgrow it. And I'm seriously trying not to be condescending here. I think I was about 25 or 26 when I noticed that my mind was starting to get "quiet" for lack of a better term(1). I didn't feel desperately pulled in a thousand directions anymore. All of those world changing projects I'd desperately started and only built 30% of when I was young turned out to be completely useless. But the experience I gained wasn't. The soul-sucking jobs that had seemed so impenetrable were actually made of interesting little problems that were fun to solve. Soon I was comfortable enough to strike out on my own as a consultant, then start a business.
I guess what I'm telling you, hopefully without even a hint of judgment or condescension is to hang on, I think I was a lot like you and it got much better for me through no special effort or grand insight of my own. I think it will for you too. Its just growing up. Not "growing up" in the awful, condescending way people say it when they want something from you. Just what happens. I truly wish the best of luck to you.
(1) Apparently this is fairly common for many adolescent sufferers of ADHD.