@ Fireblade - I was doing that same thing. More than.. Got tired of it.
Also, if you're decent/good at drawing -and you've got some speed, people really enjoy watching you draw.
1) What's wrong with being a quiet person?
2) You don't sound anti-social - you've found something you enjoy doing more than hanging out and doing stupid stuff. Congrats.
3) The family thing could be difficult - you have to decide if you want your life to be art, or if it's a hobby. If you want it to be your career - educate yourself MORE about it, then educate your parents about it. Let them know its what you want to do. Your parents should WANT you to do what makes you happy, so they should be open to it as long as they see you're serious about it. Art is a difficult field (with that in mind, what ISN'T a difficult field in today's world??). So make sure it's what you want. If it IS, hit it with everything you've got.
Doctors heal you, Artists immortalize you.
"Those who can, do. Those who can't, teach" - bullshit.
The usual staples for anatomy: