Mile time question? please answer!!?

okay so i am a 14 yo girl and a freshman i run distance track and xc. yesterday i went to the track by myself to run after some stretching and a warmup mile, i decided to run a mile at a fast, but relaxed pace, i came through the first 800 at 3:13 and then felt like i could pick it up and ended at 6:14 when i finished i wasnt that tired and only a little out of breath. i felt like i could have gone faster during the first 800, so my question is what time do you think i could run in a racefor the 1600? (we havent had a meet yet)