I've done track for 3 years now, and can't get under 7 minutes for the mile. I'm female with really short legs, however I'm not overweight (5' 4" and 107 lbs). I train really hard, but can't seem to do it. Is it possible that there are some people that are this bad at running? I feel like I must be in the bottom 1% of runners based on natural ability. Ugh. Any suggestions?