It seems to me that if you want to have more meaningful relationships the only real solution is to go out there and make them. Easier said than done, I know.
You have two main ways- meet them online- yes even on a porn site like this. It's possible to get along with and find some connection with the people you meet on chat or on forums.
The second way is to take on activities you enjoy and hopefully meet someone who enjoys the same things you do. Even if it is only as a friend- who knows–someone you know might introduce you to a future relationship.
If you feel that porn is holding you back though, you have a decision to make- you may want to give it up and push yourself to find more meaningful connections.