A random assortment of thoughts that occurred to me:
1. Why do you have to "fool them?" If someone is hitting on me and they`re nervous, I actually find it more appealing than bravado. "Gee, I`m really nervous but, uh, you wanna go out?" is a better route to my heart than "Hey baby, you`re coming home with me!"
2. Physical symptoms like shaking are often the hallmarks of social anxiety disorder. Have you tried talking to a counselor? A professional might be able to talk you through better understanding the source of your anxiety and help you find ways to deal with it.
3. Have you tried self-medicating with various relaxants? Head to a bar, have a drink or two, and practice putting the moves on pretty people after the alcohol has taken the edge off your nerves. Or, there are things you can smoke that can make you chill out a bit. If your attempts under the influence are successful it can give you more confidence when you`re sober, and if you`re rejected it can help you learn that rejection isn`t really that big of a deal. Don`t use alcohol as a crutch, don`t become dependent on alcohol, but a little now and then can be a nice social lubricant.