I cannot keep my feet in the correct position while riding my bicycle. The most comfortable spot is in the middle of my foot. Sometimes I am riding on my heels. Is my bicycle to small? I just bought a Cannondale Hybrid Feminine S and am 5'5''. I have 139 miles on her so far. I have the seat pushed back as far as it will go. I believe the seat height is adjusted correctly also. When I first rode my bike, my feet would not stay on the pedals. That has gotten better. When I look in magazines, I see cyclists riding on the soles of their feet. What am I doin wrong?