I totally identify with you.
You're probably an introvert. There's nothing wrong with that. Do what pleases you and maybe you'll eventually find someone you care for and if you don't, who cares. Love is overrated.
As for using that friend. Are you sure this friend doesn't know that you're "using" her? Your friend may totally understand that you are using her for the purpose of updates and simply not care. Some people only hang out with me because I get good grades and they know I'm willing to help them cheat at any time. I know they're using me but I don't care.