I knew I wanted to draw around the 3rd grade. I have no idea what age that is, but that's about the time. I did the normal kid stuff at the time mimicked what I saw. Copied over a lot of Disney and X-Men. Colored with cheap colored pencils, and generally did it for fun.
I started to "get serious" in middle school. Or at least, I thought about being a creator as a potential career. This is the time I narrowed down my scope from general drawing to sequential art. I continued from there, and made goofy little comics. I kept up a drawing routine that I would call, "convenient work." Basically, I would create when it suited me, and if I wasn't "In the mood," I didn't work.
That all changed, when I went to SCAD. I went for two years. (It's so f-ing expensive, so I had to leave.) I majored in sequential art. I learned my best lesson while there: Artwork is really "Work" with the occasional art. I learned to fill up sketchbooks, draw constantly, study anatomy, and really put effort in. But I still didn't, "really get it together, creatively."
I left and changed majors to Graphic Design. I went to a small vocational school, and learned how to use the creative suite backwards and forwards. I spent several years fighting the good fight, in graphic design. It was all right, but ultimately unsatisfying. No groove to be found, but I finally learned something fundamental: Creativity and talent get you only about 10% there. (Yes, maybe for others it gets you more, but I doubt it. What seems effortless and so easy for some, is really still the 10% with 90% being a good routine.)
So at about 28 I finally learned my lesson. So I changed careers, I changed to computer science. I started going back to school. When I wasn't in class or doing homework, I spent all the time I could spare on art. I don't know that I found my groove, but developed a process. I set personal goals, and deadlines. I stuck to a process. I started making prints, and art to sell. Once I was more comfortable with my routine, I started Pretty Power Princess. I started that at about 32-33.
I'm 36. I'm a web developer With my artwork no longer being the main source of my income I feel more creative and focused than I've ever been. I continue to develop a better and better process. I see improvemtents, and most of all I'm having fun.
I would tell you how many screw ups I've had, but there are millions, maybe billions. Too many to count. Your process, if you're constantly working, doesn't give you time to focus on the past. Just move to the next day, the next checklist item, the next drill, the next sketchbook. It will all move along.
Sorry for the life story, but it's a complex question. One worthy of a complex answer. In summary, I say, "keep it up." Work. Just work. "The groove" isn't a glamorous thing, and it's not something only the most talented can do. It's a nitty-gritty process. The ability to get as much work in as you can, and constantly try to refine the process. I'm still not there. I don't know that I'll ever be. But I love the process. I love the work. Love the work, and in my mind, you're in the groove.
Sorry for the sloppy writing, I was in a hurry.