American Football Position Suggestions for Offense and Defense?

Hi :) I'm currently Sophomore and will be playing for Varsity next year(1st year), and I just wanted ask people/players which position would be most suitable for me. Right now, I am playing as a D-lineman(nose guard, since it's my first year so I thought being in defense would be a good start) but I still want to know my potentials. Right now I weight 200 pounds and can run 5.1(no gears) in 40 yd dash and I'm about between 5'8 and 5'9. I dont mind blocking for others but I personally like running with the ball. Many suggest that losing weight in fball is not a good idea, but I'm planning to lose weight to 185 or around there and increase speed. Please suggest positions in both offense and defenses :D Thank You! (btw my friends suggest me being a HB (we don't have fullback) but would that be a good position for me?)