Fullback or Center in Football?

If you're faster than the current fullback and he's stronger than you, just flip positions, he should provide better blocking up the middle and allow you more space as a full back to run or go through the hole as a lead blocker (unless he has terrible blocking technique and just can't block at all, in which case you should have your pick of the 2 positions). Also, it sounds like you have the speed to move to outside linebacker and possibly be even better than you are in the middle (especially if you're a good pass rusher).