What football position do you thing would suit me best.?

I am 5' 9" and 15 years old. I have an athletic build. I weigh 155 pounds. I run about a 5.07 in the 40 but i am getting better at my speed steadily. I used to play receiver and cornerback but i wasn't really fast enough and i have average hands. I can tackle and brake tackles though. What are some could defensive and offensive positions i could try out. My coach requires me to have both. Thanks also I'm gona play for JV this year.