Psychokinesis (or mind over matter).
This kind of ability pretty much guarantees a roller-coaster of feats you could do.
Flight, conversion of matter from one form into another, enhancement/regeneration of your own cellular structure (for extending the lifespan or preventing fatal injuries), keeping up a low level personal field around your body that prevents anything from getting through (and that's just the start).
With enough time on your hands, you'd likely be able to 'evolve' the ability into something else down the line.