Oh I've had that too. You're just talking to the wrong girls. This happens to everyone, even those who don't stutter. Guys are often attracted to popular girls but these popular girls are so popular they can easily dismiss guys because they get propositioned so often. The problem is that you're not being clever about whom you talk to. What about the shy girl you probably pass in the street or in the hallways and never even notice? I bet they'd love to talk to you, even with your stutter.