Closing Doors

I've shut almost everyone I know in real life out. I needed to. I've already done it once, and I was proud of what it had done for me. Except, this time...I'm miserable. I feel empty inside almost everyday. It's not due to the fact that I don't have anymore friends..I'm not sure what it is. Maybe the fact that I feel like I have nobody to care for but myself? Am I experiencing the feeling of selfishness? Is it because i rely on my own mind to cope through hard situations, instead of being able to talk about things with someone? I'm not sure anymore. The people I do talk to all live miles and miles away. Sad to say, I will probably never meet them. Which is even harder..especially since the majority of them are better friends than I've ever had in real life. Shit, I'm closer to them than I am with my family..now that's sad. But to be completely honest, I don't care. At least I have them right?