I'd tell myself to avoid 40 year old black male pedophiles named Greg... :/
And to give up the watch, its not worth it, unless you really want to see two girls naked as a prepubescent child with no sex drive.
I believe those two simple things would fix all future problems, because all problems I have now is how stoic and apathetic I am, and I had a very long phase of hatred, and had no friends because I pushed people away, and in arms with having no friends comes an increase in bullying.
Also, look up the band AIR.... You will like what you hear!
I could also just tell myself to run away, far away, as far away as a I can, and look for a new family.... I used to say no to that because there are so many people I care about that I would be afraid not to meet... Then I realized how nobody really cares in real life. Care bears are a lie.