I don't know what to do about my shyness can someone help me?

I just recently met this guy and he seems like the nice but wild type (which I really like) and we talked a little bit and he made me open up about a lot of things because I am really shy. Well whenever I see him I am really quiet and he rubs my back and talks to me. My sister always asks, “why don’t you talk to him”, and he always comes in and says, “because she is shy”. He can always read my mind I never have to actually say anything and whenever we do talk he always says, “your opening up”. And I will always remember the first conversation we ever had when I told him I never had a boyfriend before; he was so surprised that he thought I was gay. He told me I was really attractive and even if I have nothing to say when he calls me he always keeps the conversation going. I don’t know why but its really weird to me he keeps talking to me calling me his baby, boo, and girlfriend. I’m the type of girl that think most guys are out there for one thing ( I know they all aren’t) but that’s just the way I think. And by now most guys would stop talking to me but he has not. Maybe he really likes me and I’m just over reacting? I’m really thinking about giving him a chance. But I’m so shy…maybe that’s why most people stopped talking to me because they think I’m just not interested? I’m really shy, but I was thinking of just sucking it up and talk to him because he is a really nice guy. I don’t know what to do, and I know that this is not the last time I will see him and he will call me I just know for a fact that I sound like I’m not interested but I really am! I try to over the shyness but then I stumble over words and I act like I’m stupid! I don’t know what to do can someone help me?