I'd disagree - genetics plays a part. Yes, I'm sure all of you in your college physics class worked hard, but you are a selected sample of people with a talent for physics otherwise you wouldn't be doing it as an undergrad. Think of all the others who didn't make it that far in the education system. Some because of lack of opportunity, or money, or hard work, or aspirations, and some failed by the education system at an earlier age, but also genetics. Within my class the person who came top of that selected group wasn't always the person who worked hardest - some people had more of a knack that others to pick up really complex stuff - partly nurture, but also nature, I'd venture. Electro-magnetic waves and plasmas - I never did really get that!
For athletes of all disciplines, different genetics will play a part - as someone pointed up above it's a continuum, not just an isolated group of Lance, Jan and Ivan, then the rest of us. Unfortunate for those of us with weaker genetics, but true, I'm sure. For endurance sports as well as other activities also, if not more so.
That knowledge doesn't stop me trying to be better, but it does temper my expectations a bit.
Hence, like a couple of posters above, I'm convinced that if the OPer had the superior genetics that all pro riders have, he'd have noticed it by now. From an early age, running around in the playground, he'd have found himself better or quicker at some activity. Not to say he can't be a quick rider with lots of hard work and commitment...but unless he has those genes I think it's unlikely he'll make pro.