Ron,
I don't know you or your personal situation, but it seems to me anything short of massive physical disability can be fixed with a lot of hard work? Please don't take offense in any way, it is not my intention. Just trying to help.
IPSC is not only a game of shooting....to get really good at it, you have to cross train.
I know where you are coming from with the athletic thing....I was never even athletic back in school, in really bad shape, couldn't play sports worth crap. When I started shooting I said enough is enough and just did what it took. Before you say I can do it because I'm young....I've already had major reconstructive surgery on one knee....the other knee will probably need it soon, my right shoulder is toast, left wrist cracks whenever I move it, and my right hand is still fractured from a couple years ago.
Unless there's a reaallllly good reason why you can't, just do it. If really sub-par athletic ability is the only reason....it can be remedied.