Why can I only play power chords with my index and little fingers?
I've been playing guitar for about four months now, and I'm getting along pretty well. However, in tutorials and the like, I keep seeing people playing power jumps with their index and ring fingers, but I can't do that. Why is that, and can I change it?
That you do not yet have sufficient stretch of tendon in your fingers.
By further practicing what you already learn, or by finger-scattering exercises you find on the net if you want to do this.