"Conversation Starting"

I've never been good at starting conversations, then again my entire life has been sitting here, in my room, at a desk in front of a computer screen. I don't go outside or really interact with people...besides in school. I feel bad whenever I'm talking to someone, say for instance on Skype, and I can't even come up with simple topics to talk about. I like talking to people about things that are currently going on when I'm gaming or stuff. For example, one of my friends, when playing Counter-Strike, I can easily strike up a conversation since we're both playing the same game together. However when it's someone who I am not playing games with it's a different story. I try to think of many different topics, however I don't want to talk about something that has already been said or mentioned before. Sure a simple "How was your day" is a nice start, but how long will that conversation honestly last for? I think at most, depending on the events that happened in the day, I'd say around 5-10 minutes. My Skype calls normally go on for more than 2+ hours...how am I supposed to fill those other 110-115 minutes? Sure you can say, talk about the future, their interest, and jobs...but what if those have already been discussed extensively. And if you're a person like me, you don't have many things to talk about your life. I play video games, but if that person doesn't extensively play video games...then the conversation goes no where. I watch Anime, but if the other person watches a small amount or none at all, the conversation once again goes no where. I wish to one day be able to start conversations...maybe I need to do more with my life than sit here and type this giant paragraph, but I know nothing will change. I enjoy sitting here, alone, typing, rather than going outside and taking a breath of fresh air. Since there will be no change, sadly I probably will never achieve my wish of being able to come up with topics. Maybe there's just something wrong with me...and me only.