Ummm, no. Most people seem to be determined, but only to do as little as possible to get by.
We clearly just disagree, but I reject your premise that most people are not physically capable of greatness. I don't know you but you're on HN and you express yourself well in writing, which already puts you ahead of 99% of people. The main thing holding you back is that you're determined to not succeed.
I think my situation is obviously not so extreme. See my reply to rick888.
I don't think you know what it means to be a failure with no real recourse -- NO recourse short of a radical alteration to my biology. Have some compassion for people for whom things simply don't work out. Everyone seems to think that if you aren't the best it's 120% your fault and in a way it's true. However, sometimes people just get bested and it's just the cards that were dealt to them with the biology they're given.