My teacher seems uncomfortable around me, what should I do?

Well, my teacher is already veryyyyy quiet (you can tell he was the shy kid in high school). I'm shy myself, so even though I have plenty of friends in that cl, I don't talk (unless he lets us, and even then I'm still quiet) and I behave in cl, so I know he's not just annoyed with me, or something along those lines. I don't dress like a tart so its probably not what most of you will be thinking lol... He seems to get kind of nervous around me and I feel kind of bad lol:(. What should I do? BTW, he's not this bad with other students which is why I'm so curious.