Take a look at John Moffat, he was a painter after school but could not make a career out of it and obsessively studied physics for two years, and he ended up being admitted to a PhD program at Cambridge due to impressing some people with his work/research and is now a professor/researcher at the University of Toronto. Another case is my friend Austin who is currently a high school senior, and taught himself enough such that he's been invited to a PhD program at Stanford and has caught the direct eyes of different government agencies for his research. I think that I am in a similar situation as you, studying informally, and would be happy to discuss interests/studies if you're interested in collaborating.
I do hope though, that you are not just doing this for some sort of fame or intellectual praise as indicated by the thread linked to by hypervalent_iodine, as that would likely guarantee that you'd fall too deep into apathy for the actual subject at some point.
Regards,
Sato