Mental block

[theman101]

So there is a girl I'm fairly interested in one of my classes. We talk to each other but both of us are fairly quiet. I think she has been sending signals and I would have asked her out already but whenever I feel good about it, I always think that I'm making her uncomfortable since there are a few girls that make me feel very uncomfortable when they try to flirt with me. I do not want to make her feel uncomfortable. Yet, we talked walking to our next class and she did not seem uninterested/uncomfortable at all, since she was laughing and answered with long responses. This wouldn't be the way I behave if I were uncomfortable but who knows. I know it's all in my head but I am unsure of how to bypass it. I think it is holding me back.