I've been fantasizing this for the past five years ... most of the time it's starting my life over the day after high school graduation and making the right decisions (pursuing college, choosing a major, getting an entry level position when they were plentiful and easy to get, not meeting my ex-husband, etc). I'm fifteen years behind everyone else because I kept fucking up all my major life decisions and stagnated all that time.
Only thing I can do is fix what happened. It gets very tiring having to fix everything and answering for ignorant mistakes, and there's hardly any room to maneuver.
Kids, don't fuck up your life. Make the Right decisions the First Time.
(Bitter? Damn right I am.)