Congrats on the License! Huge accomplishment!
I'll tell you what I'm in the process of doing to give you one possible route. I started flight training when I was 15 and 1/2 or so, so I can relate to your feeling of having to wait foooorever to take a checkride. I, like you did, got my private in high school and was able to wrap up the instrument (both under Part 61) before entering college.
First off, at this point you probably don't have to worry too much about the age problem. The next age hurdle is 18 to get commercial, and by the time you finish instrument, and are ready for your commercial checkride, you will likely be 18. You don't have to, but getting a college degree is a very good idea. If all plans fall through, many employers don't even care what the degree is in, as long as you have one.
Where I'm at now, is at a college (Ohio State University) that has an aviation program. There are several in all parts of the country, Purdue, Middle Tennessee, Embry Riddle, Witchita, NC state to name a few (the one's I looked at). Here, you are getting college credit towards a professional pilot degree for your flight training. I'm going for a degree in Aeronautical and Astronautical Engineering, while getting college credit for flight training, so you don't have to get a degree in Aviation (aka professional pilot), I could just as easily get a degree in Communications and still get college credit for flying. This is how most of these Aviation colleges work. I'm done with my CFI, wrapping up my Sophomore year, so you could still be right on track with where you would normally be if all your focus was on flight training.
The downside to this option is most of these colleges, including mine do not include the flight training in the "get a college degree package". It's very very expensive, since this is ON TOP OF TUITION. Granted, you would spend the same amount of money on flight training regardless of where you go, it's just a matter of whether or not you want a college degree/tuition costs with it.
I know this is long, but one more thing is that many colleges have an ROTC program. If you're considering going into the services, you could do ROTC and flight training!