They may also experience negative feelings about themselves, and worry about how others view them.
Prepare yourself to face rejection and learn from each experience.
Let things roll off your back, rather than taking them too seriously.
Or is your body language open, expressing your interest? It'll do wonders for your confidence, or at the very least make you look the part.
As a shy person, you might also have a tendency to keep your jacket and raincoat on in the middle of a hot and stuffy bar. Once you find out your shared interests - whether it's cooking or bungee jumping - that's when your confidence and flirting skills can slide their way into the conversation.
If you're feeling stuck in it, these steps might be the way to go.