If I were to Have One Superpower, what would it be and why?

     If I were to have on superpower it would be to go back in time.  I would pick that superpower because it would give me the ability to go back into the past and fix all the mistakes i made in the past.  By changing the past, it would also change the present.  I know, I am supposed to live life without regrets, but there is nothing more that I want than going back and change as much as I can. I would go back in time and correct every mistake I made as a person, a student, and a teenager.  In the 8th grade I did a lot of thing I knew I should not have been doing.  I smoked cigarettes at school and I was eventually suspended.  For 5 days i stayed home and did absolutely nothing. I was not allowed to go out anywhere or talk to any of my friends, all I did was stay home and watched tv.  I couldn't even do my homework because for 5 days every single assignment counted as a 0.  I remember that whole year I worked hard to get those grades and I through it all away by doing something that was not even close to worth it.  Not only was  suspended, I also lost my reputation as a good respectful kid in the process.  Everyone though I was a good, bright kid, but my getting suspended for doing something like that, my reputation turned around 360 degrees.  It was like I was a totally different person.  Everybody thought i was the bad kid and all the respect everyone had for me was gone.  I knew that I didn't change as a person, I was just curious because face it at one point in our lives everyone becomes curious.  At that age I was curious about smoking and drinking.  I wanted to try it out, I never intended to smoke constantly.  At the time I tried it I thought I was never going to get caught.  I thought I could just try it and get away with it.  Unfortunately for me and a few other people, someone told on us and we were suspended.  I was mad at first, but then I really thought about it and me getting suspended was a good thing.  It gave me a wake up call to never do something so stupid again unless I am of age.
     It has been a little more than 3 years now and I still regret smoking on school campus because till today my reputation has still not fully come back.  If I had the superpower of going back in  time I would have never smoked and never have gotten suspended.  That would have changed a lot of things in my life right now, but there is nothing I can do about it at the moment.  People still see me as the bad boy or the bad influence, but all I can do is show everyone that I never changed and I am still that same guy everybody thought I was.