Running Help?? I don't know what to do! 10 POINTS BEST ANSWER!?

Okay, so for field hockey we do a run of varying length in the beginning of practice, and I have a friend who beats me during a lot of them, and when we run together I have to try a lot harder to run at the same pace. The thing that REALLY pisses me off is that I practice a lot more than her. I run on all of my days off (its preseason so we only have practice 3 times a week) and am always changing it up (tempo runs, interval type runs, ect.) and I push myself insanely hard during all of them. It's not fair and I seriously don't know what else to do. Please help me do something or explain why this is happening?