I have an extreme fear of thunder. How can I get over it?

Last night there was a huge thunderstorm. I'm woke up at one am screaming bloody murder and shaking because of the thunder. I couldn't stop screaming for the next minute or two, no matter how much I wanted to. I dove under my bed shaking and couldn't move other than to cover my ears and shake. I sincerely believed I was going to die. My mom got me a drink and turned on Martha Stewart because her voice has a calming effect on me, which I know is odd. I layed under my comforter crying for the next few hours while the storm raged on, all the while listening about how to make glitter cards and bake the perfect pie. I finally got to sleep after the storm quieted down, but I feel like the biggest wimp ever. I'm a 17 year old girl, and I don't have very many other fears. Thunder is the only thing I freak out over. How can I get over my fear, or at least remain functional during storms? I'm the same way with loud thunder at school, work, and with friends.