How to check?

Well, there is this girl whom I like and I know she likes me as well to a certain extent. But I am not sure that she likes me in that particular manner. She is quite pretty and good looking. The problem is, we have a certain communication gap. I kind of get boring while in a conversation with her, I try to act nice and sober. I am not so good when it comes to the opposite gender. i think she thinks that I am boring.

Suggest me on what topics should I talk with her.
How to check that whether she loves me or not.

Friends I am in dire need of your advice.