If you're saying if I had a 1 shot chance to change whatever I wanted from the start to now, then: I can't imagine changing anything since when I think about how every little change can change things so much. I might not know the people I know now. I might not even be born. I may not have whatever. I'm contempt enough with life as it is right now and wouldn't want to risk changing anything.
If the question is what would I do if I was like a god and could do whatever I wanted I would: Give myself a few powers, invisibility, teleportation, and telekinesis. Then I would use my God powers to make my God powers go away, (except when I die I come back to life as a God without a human body), until I cut off the tip of my finger, like from the knuckle below the nail up. This would ensure that I don't abuse my God powers and fuck everything up unless I really really wanted/needed to, and prevents my accidental permanent death.
Edit: And be happy you're able to be bored and you're not out there starving somewhere with nowhere to live, you selfish bastard.