So you are senior in highschool?
Low resting heart rate can mean good cardio health but it doesnt mean that you will have speed as well. Most likely you will have better endurance than average.
Could indicate a problem but could mean that your heart is working very efficiently. If you have played other sports like basketball where you run till you are really out of breath and you were fine, then i wouldnt worry too much.
You can ask the doctor and the doctor will assess further.