mascardr,

You are a small person but have trouble climbing...

Consider that climbing is really not JUST about being small but largely about having a favorable weight to power ratio. Do you lift weights through the winter and early spring, including things like squats and leg press, or leg extensions and curls?

Being light is great but being light AND powerful - watch out! And don't worry about "getting big and slow." Smaller people very seldom "bulk up" to the point of it being a detriment.