Hello, you have some great advice here.
I would like to add that at 16 you are probably going to be a very fast learner, pretty strong and looking towards college. I would recommend you think about a boat like a 420. These are collegiate and Olympic class boats, of about 14ft, that you can easily single hand. They have a removable rig and are easily trailered. They have a much larger, fuller cockpit than a laser or a sunfish and you can spend a great deal more time aboard comfortably and dry (as compared to a laser or sunfish). You can potentially bring more friends. It could also get you competitve for a college sailing team.
I sailed them in college and grad school and even though I have had and have sailed much larger racing and crusing boats, I think back to the fun I had on them often.
A Lightning could be another choice.
You should be able to pick up a 420 or Lightning easily and inexpensively from a sailing school fleet or club fleet.