I totally get what you're saying, since I don't consider myself a pro either. That being said, there's a video by Trent Kaniuga (or at least I think it was him, I should check) where he says that if you're selling your artwork, you're a professional. It doesn't matter if you're not on the same level as your heroes. I mean, realistically, how many people are at the level of, say, Frank Frazetta? Not many. But that doesn't mean that you can't be a pro. Many years ago I took an illustration course, and I remember that my instructor once said "Frank Miller is a genius, he made a career as an artist and he can't even draw very good." I'm not sure that I fully agree, but I understand his point. A more extreme (but controversial, even immoral) example would be Rob Liefeld. That guy doesn't have good fundamentals at all, that's for sure. He can't even draw feet, which is why his characters always have their feet covered by something, like a little hill or whatever. But he made a career as a professional artist nonetheless.
I'm not sure what what I'm trying to say. Maybe have more confidence? I don't know.