There's a lot of things we would want to do by the time we're 18. I want to do a lot of stuff, I know how you feel because I'm 14 years old myself!
But here's a suggestion that is more important than some other posts to your question:
Don't waste your time with relationships and stuff like that. It's only gonna end with a breakup and heartbreak.
Take a little time and get ready for being an adult. You only have a few years to be a teenager, and you can really use it as a base for the rest of your life!
Face it, you're gonna be an adult much much longer than you're gonna be a teenager. So be ready for most of your life. I'm not saying to become like your parents just yet, just try to break all those bad habits that you don't wanna have when you're an adult.
But no duh, have fun! :)
I'm a teenager myself, so I'm not gonna waste all my tine on the future! Do anything and everything that you've been dying to do! You don't have full responsibility until you're 18, so enjoy every minute of your youth :)
So go out there and have fun! :D
Good luck with the final months of your teenage years! :)