why wont my facebook friends talk to me?

[?]

Well, the answer to your question is in your post itself. You said, "i always write to them. but they never write to me,". Maybe they find you annoying since you're always messaging them, ease back a little. Also, yes, it is possible for someone to know more than 1,000 people and be friends with them. You'll start achieving this if you go out more often rather than being inside all day on the computer or by the time you're in High School.

[Edited]:

Wait, you're 23 and still have horrible grammar and punctuation? Well damn, the way you reply to people is the obvious reason why no one wants to talk to you. I wouldn't be friends with you either. Also, yes, people do know 1,000 people in real life and are friends. You just need to get out more, join a club of a hobby that interest you, and be more friendly with people.