If it turned out the way it did in my dream a few years ago; I'd do exactly what I did in my dream:
I'd help my friends stay alive (most of them had different powers, as well) and mobilize to find others of our kind. In the end, we totaled 144. Our wonderful, paranoid world leaders lead such a devastating attack against the mutations, that by the end of the dream most of the world was destroyed and the 144 of us managed to escape to another dimension thanks to some help from the mutants of that dimension.
I wasn't too thrilled with my super-power at first. My two best friends had awesome physical abilities (super-strength and the ability to jump great distances) and at first I didn't even think I had powers. Later I found out I happened to have heightened problem-solving skills (I dislike the term 'heightened intelligence' because you can't just absorb knowledge out of thin air). Then later on I found I didn't need to eat, drink or sleep and pretty much nothing could physically harm me (I found this out by my surviving through a nuclear explosion). By the last time I had one of these types of dreams; I had telepathy, strong telekenetic powers and the ability to teleport anywhere I wished.
I have alot of weird dreams. This one happens to be one of my favorites just because it was such an epic story. There's much more that goes on than just the brief outline I gave above, the beginning is really interesting. I might write it out someday...