In addition to the normal investment stuff (for me it would probably be Bitcoin, or maybe shorting the market in 2008), here are a few things I'd have to consider:

1. I'm now an atheist in the body of a teenager who is super involved in his church and private religious school. I'll need to be delicate in navigating this, as I can't just suddenly turn all those things off.

2. I'm being dropped into one of the toughest years of my life mentally. All the bullying I suffered starting at age 10 is finally manifesting in bouts of anxiety and depression. I'll be better able to handle it, and even push back at the new round of bullying. I don't know if I'll still be friends with the same people.

3. I'm going to get another shot at my relationship failures, starting almost immediately with my high school crush. I know that my wife will be waiting for me sometime in the mid 2010s, but all the very many other chances I had are also in front of me. I'll have the experience to better handle them, and I'll won't have the inhibitions and hangups of my youth (see point #1). The question is what to do if any of them turn serious, as again, it will be another 10 years before I will be able to meet my wife.

4. I'm going to get another chance to consider my career. I don't think I would change it, as that would mean not meeting my wife. However, I know there are things I could do better that would make the first 10 years of my career more fulfilling.