I had an athlete (girl) from several years ago that ran 4:50s for 1500m and 10:50's for 3000m and walked on at Stanford during their NCAA championship run. She was able to walk on and race the local races and was given the chance to compete at the Pac-10s. As a result she now has a NCAA championship ring.
don't listen to these nay-sayers. Enjoy a great education, take advantage of a great opportunity to compete at the next level, and come back to this site in four to five years to let these folks know how it went.