What position should I play in american football, I play rugby. I am 14 years old and 5 foot 8.?

i am 5 foot 8 weigh 140 pounds and I am 14 years old, I never played american football but I play winger in rugby because I live in England. I score at least one try(goal touchdown) in every single game. I have a 28 inch vertical jump and I am the fastest player on my team.I have very muscly legs and I had big and long arms. I also have big hands(my arms almost touch my knees). I can run away from everyone in my league and I can break through tackles(my whole year(grade)call me Lightning as a nickname).I have very very good agility and can side step(trick step) like crazy I also can catch pretty well. People say I have an amazing hand off(stiff-arm). People say I should play running back or wide reciever. I think I will do best as a running back as I have good acceleration. Any Suggestions.