Every time I have a crush on a girl, I tend to put her on a pedestal. I imagine a too perfect version of her, putting her to such a high standard that she can't possibly reach. I'm thinking of things that might happen between us... but all I'm really doing is mentally jerking off to my idealized version of what it could be.

How can I avoid doing this? What attitude should I have towards girls that I like (and possibly like me back)?