1. Be nicer to your mom while she's ill. Yes, you're under a lot of stress trying to juggle being a normal person and having a mom with cancer--but you'll regret some of the fights when she's gone.
2. Don't take it personally that nobody asked you to prom. You'll get told that you 'got hot' in college.
3. Don't be so solid in your career ideas, you may end up passing up a great opportunity. But no worries, you didn't, and it worked out for the best. You will have the coolest job in the world, little me
4. As a follow up to #1, don't be afraid to tell your dad that you do need to talk to someone. You'll 'feel better' years earlier than you did without it