The answer would be... you're a teenager! As for the angry and the racing that you mentioned. Hormones would be the most likely culprit. It seems like you've realized that grades are actualy important and that's already alot better than many other people currently having problems in school. As for the energy you're speaking about it's also natural. I highly reccomend a sport if you aren't already in one. It's a place to spend it all and a good way to get your attention of something else while you take off some of the stress. Plus, if you're feeling lonely it's a good way to meet people. As for focus keep trying dicipline is the key. Keep off the stress the best way you can and try hard not to worry. And if you have problems, which approximatly 100.0% of teenagers do, find a friend and tell him or her what's on your mind. You'll feel better.

Yeah my basketball season is starting soon, so hopefully things will straighten out.