It may be the law, but what's legal isn't always smart.
I in no way want to make this a personal attack on ktsai91, who was smart enough to come here for guidance. We should support him and help him get going in the right direction. I just happened to look over in the medical forum and see that we're talking depression and ADHD.
SP requires you to self-certify that you are medically and psychologically fit to act as PIC. He needs to get himself healthy first, then worry about flying. I'm sorry, but there are many cases, both chronic and situational, where you are 'OK' to operate on the ground in 2D, but should NOT get into a pilot's seat and try to operate in the 3D world. Here's an FAQ from the FAA site:
http://www.faa.gov/licenses_certificates/medical_certification/sportpilots/
Also look at 61.23 (c)(2)(iv) and 61.53(b)
With a private pilot, the medical acts as a safety valve to ensure that people fix their problems before flying, but for SP, the 'self-certification' thing can allow people to fall through the cracks.
Just imagine the headlines if something were to happen- with all the fear mongerers out there in Congress, DHS and the ignorant general public, they'd have the SP program shut down in about 30 seconds. People are looking for excuses to get rid of GA in the US-we all as pilots need to work as hard as possible to minimize the number of excuses.
Ktsai- you're only 17 so you have plenty of time-I didn't start flying until I was over 30. Keep the dream alive- go get yourself healthy, then start working on flying. In the meantime, there are a few other non-flying options: find a CAP squadron, work at an FBO. Networking can pay huge dividends for you down the road.