I hear you. I've been gaming since 1983, on so. I was only a player for about 6 months before I got the GMing bug and have spent 85%+ of my time behind the screen. My home brew world started to take form in about 1985 and I used it continuously for about a decade, before taking a couple years off for WoD and Hero. I rolled right back into it, though, and finally realized in the mid-2000s that it had run its course, so I decided to sunset it with one "finale" campaign that would answer some questions I'd left hanging for years. The 3.5 system was so heavy that I wanted to drink bleach by the time I did wrap it (about the time 4E was released). I found 4E... less than inspiring, and it darn near took me out of gaming permanently. 5E was perfectly timed for my group, though, so here we are.
That's a long way to go to say, "Don't sweat it." After a break, I have several ideas floating around in my head. I'd love to build a new home brew world. I'm also excited by some other systems out there, like FATE and the nWoD. But... my whole group is at that "career and kids" stage. We mostly just want to blow off some steam. So, I've been running the published modules. I've been using Eberron because I loathe FR and the players wanted to go with a published setting. It's fun. We're all having fun.
There's no pressure, but I can get in and tweak some to fit Eberron whenever I feel like it. Or not, if I don't have time. That pretty well scratches the world-building itch. The fact that WotC hasn't done a worthwhile 5E conversion scratches the tinkering itch. Surprisingly, I've discovered I have more of an itch for tinkering with rules than setting. I'm still drawn to building my own setting, but it's not a burn. I very well might build a new world, when we get done w/ PotA, but I don't know.
I've also realized that successfully running a published adventure is its own skill. I guess I've always known that, but what I've learned is that it's not an "inferior" skill to rolling your own; it's potentially as difficult and rewarding. Give it a shot and see what you think.
Either that, or do as others have recommended and see if someone else is willing to GM.