The 1st thing you need to understand is that no one can read your mind. You must be able to communicate your ideas and thoughts to people - People cannot just sense what you're feeling without you communicating it in some way.
The easiest way of doing this is just touching the girl.
You don't go right off the right off the bat and try grab her pussy. You must start low like trying to touch her hand or arm. But you must use an excuse like palm reading. Keep doing things like this until she is comfortable with your touch
Next what you do when she is comfortable is just can hold her hands and caress her and create a romantic connection between you to. Once this point is reached you speak about deep things that can connect you 2 and you can really see if she is the girl for you
Finally step is to move it into the sexual sphere. This is the most risky but the most rewarding. if you're able to make her feel comfortable enough you can try can her boobs and make out with her and eventually put your hand on each others genitals and get the point of sex.