This was one of my biggest issues in high school. I didn't realize it until senior year when I was actually trying to get to know people. That's when I realized that I was self-centered, and it depressed me greatly. I went through great lengths to try to get to know one particular person but by then it was too late.
What's tough about it is keeping a conversation flowing. It's easy to talk about your interests. I bet you, like me, could go on and on about your various interests, but when others are talking, it's hard to pay attention. I tend to zone out until what I'm hearing is, literally, "blah blah blah blah." I either ask them to repeat themselves or let it go.
It's not that I don't care, it's just that I'm probably distracted by something in my environment. Still, I go out of my way to ask questions when I can, (try to) make jokes, or nod my head.
My social life is terrible...so I can't really help much beyond what I've written 