if you are fast enough and can catch i would say wide receiver if you wanna play on offense. regardless if you can catch or not you would probably make a good defensive back also. if you put on some more weight at that height you would also make a pretty imposing linebacker.
I really need to know your age, because the answer could be drastically different depending if you are 14 or 17 years old. My guess is that you are somewhere in the middle of that age and if so I would recommend that you focus on playing Offensive Guard. Your 40 time somewhat limits you as to what you can and can't do, but there is no reason that you cannot hit the weight and add both strength and speed enough to be an effective guard. Guard is a very fun offensive position to play because you are often called on to go to the outside and block downfield. I hope that this helps and wish you good luck in the future.
Linebacker or Defenceve end
Try everything. Statistically for a fourteen year old, you're a little tall, so try Quarter-Back.
The dimensions of an NFL football are: long axis: 11 to 11.25 inches long circumference: 28 to 28.5 inches short circumference: 21 to 21.25 inches weight: 14 to 15 ounces inflation: 12.5 to 13.5 pounds
either wide reciver or qb
1 horsepower = 550 foot-pounds per second 30 inches = 2.5 feet (2.5) x (220)/10 = 550 foot pounds per 10 seconds = 1/10th of a horsepower.
cornerback or safety