Help me get over my fear of men?

On the outside, I am a strong, composed young woman, but, when I'm in the presence of a man, I am completely terrified on the inside. If they speak to me I jump, and I fidget when they're anywhere in the room. I've been doing my best to get over it, but it's not easy...we've been in school since August and, just now, have I worked up the courage to speak to my male teacher. I really need some help.