go buy a crappy computer and blow it up... 8 or 9 times, after a while youll learn whats going on, and how to fix it
find some parents you can move in with that know jack about computers, get them to buy a new PC, burn 1 CD or check their email for them, then they will come to you with computer questions for the rest of your life, and youll spend tons of time figuring out whats wrong and developing your troubleshooting skills, in review:
1) move in with dumb people
2) buy PC u know will break
3) burn CD or check email so they think you know stuff
4) learn how to fix every computer problem, because they will come at you with all of them
*PS* its good to see people wanting to learn about PCs, i was exactly where you are about 5 years ago, and look at me now, im 19, i make $12 an hour, (after only 1 year of college and no certifications) and i sit on my butt doing something i enjoy! woo hoo!