In the history of skills (guitar playing, mastery of swordplay, music composition, etc), it's not inconceivable that someone could go a long time and not happen to notice the same things that masters of the discipline have been taught. Most human endeavors and learning comes not by independent discovery of everything, but by building on what the people before us have learned. It's a rare genius who can skip that.
Swordmasters in the renaissance studied each others' books and teachings, much as physics students might study the publications of others in their discipline. The insights they each made might not have all been in technique itself, but sometimes in new ways of teaching it, or describing the nuances of what their masters ("no, do it THIS way ...") had told them in a different way which made it easier to teach.
For many physical endeavors, it seems like there are often a few Good ways to do something Right -- shoot a bow, hold a calligraphy pen, etc. You MIGHT stumble upon the best way to do it on your own, but it seems a little ridiculous to scoff that someone is "not creative enough" to figure out what nuance of technique they have been missing.
No, I've figured out LOADS of stuff on my own and then found others had done so, or had different names for it. I started doing hybrid picking when no-one I knew was doing it, and other techniques. Remember as well, this was in the 80s - there just wasn't the access to information that is available today; the kids I teach now say "how are you so good at working things out?", but it was the only way to play most of the music I liked when I was a kid; good transcriptions were like hen's teeth, and I remember having to negotiate with the guy who owned the paper shop (where I had a paper round - remember I was 14-15 at the time!) to speak to his distributor to order american guitar magazines so I could get the good stuff. I'd go to London once every couple of months and buy a VHS instructional tape. It wasn't like today when you can find an in-depth lesson from a world master within 5 minutes.
But the point is that it was one specific (and subtle) technique that I missed, and everyone else missed, or didn't instruct people to do - that completely stalled my playing. And I know I'm not the only one!
I play double bass, not guitar, but I suspect there are parallels. My answer is: No, I'm not creative enough, or maybe too creative. In my view, most technical experiments are blind alleys. And a problem with musical instruments, perhaps with double bass as an extreme case, is that some experiments can lead to permanent injury.
I have met two fine young bassists who were both crippled by trying unorthodox techniques, to the point where it interfered with their careers: For instance they had to curtail preparation for critical auditions.
Meanwhile, I have consciously stuck with the stodgy classical technique that I learned as a kid, and at age 52, can still play a four hour gig on the one instrument in the band that never gets a break.
(say, extended guitar playing techniques)
An open question so far.