I was like you back in high school. I still am like this today at 23 years old.
They say you grow out of that phase but you never do. It's not even a bad thing, it's just our style of doing things.
1 - If none of my friends call me for about a week I immediately start thinking to myself that they don't really like hanging out with me. Then the next time they call I will make excuses not to go out because I feel as if they are only calling me out of pity. (ex. "Oh, maybe we should call James." "Did anyone call James? He'll know we hung out because these pictures will be on facebook.")
2 - I am deeply paranoid about the number of friends I have on any social networking site. If I had 601 friends yesterday and today it dropped to 599, I will immediately open my friendslist and scan it to see who deleted me.
3 - Talking with my friends in public who are NOT friends with me facebook is always awkward. They seem nice enough when we hang out but I have that feeling in the back of my mind that they are only putting on an act for me. I think that as soon as I leave or turn my back, they are saying mean things about me. I mean, if we aren't close enough to be friends on facebook then I must offend you or something, right?
4 - I never forget things that people did to hurt me. If someone has wronged me in the past I may say that I let it go, but I will always remember. Even my best friends who I see all the time are not exempt from this rule. I am an extremely patient person, and will wait years sometimes to get my revenge.