I wrote an released some open source software in my spare time. I just stopped watching 2 hours of TV a night and coded then. I would got to the pub 2 hours later than my mates, I would miss popular TV shows (X-factor or whatever) but it was a lot of fun and I enjoyed it.
But I do think there are people who just feel the need to make things, they just get on and do it.
People who question how makers find the time.... hm, it's like I question how people have the time to watch endless Netflix shows. Where do you fit that time in? Oh, you aren't making a hydrofoil in your back room? OK, that's currently what's taking up a lot of my spare time.
I think humans were designed to enjoy making things. As soon as you start using your hands and brain and try to make something that no one else has -- enjoyment happens.
The other day I had the option of buying some rope on eBay and getting free splicing. Wow. Challenge accepted! I purchased the more expensive non-spliced rope and spent a week learning all about splicing. It's amazing how many new places around my house a bit of spliced rope came in handy.
Don't get me started on how many hours of YouTube videos I watched on rope making. I spent many a happy hour at a friends garden making string and rope out of nettles. He thought I was a bit nutty, but he used the string to tie up his beans. His kid used some of it to make a den.
I'm getting distracted. Everyone enjoys making (kids love lego) you just have to accept that you are re-inventing the wheel and not to worry about it. You won't get famous. You'll just enjoy life more.