Opening up to Someone

I recently had a webcam convo with my girl. Me...I'm a sensitive dude and yet I don't about what I think or wonder about. I don't even talk about myself much. I listen, so its hard for me to open up to someone that is really special to me without getting nervous or emotional. Questions like "Why do you love me?" or responding to "I don't know what you see in me" gives me jitters. I'm not saying that I don't know why I love someone or I don't see anything in anyone, its just.... nerve wrecking I guess. I don't know. My question is... if you're someone that is really shy and don't talk much... how do you change that? Like, I have yet to TALK. I can complain or write/type stuff down and make it seem like I'm outgoing, but I don't know how to overcome that. Oh well. I'll figure it out and get used to it sooner or later