Originally Posted by
srode1
Getting more aero will help for sure at 20mph, but so will raising your FTP. .
This!
And patience. At 17, 18, 19 I couldn't average 20 mph for very long, even at 150 lbs. I think even with clip on aero bars my fastest 6 mile TT was only about 22ish.
Just no power.
It took a few years for my body to develop to the point of getting the strength and aerobic ability necessary. At 115 lbs you're simply not going to go fast on the flats at the moment. Keep getting in consistent mileage, though, and over the next few years your body will continue to grow and adapt. Learn pack skills, learn how to corner, work on the aero bits, and the picture will come together eventually.
Or you'll always be super light and have to pick your events accordingly. Certainly no problem with that, either.