i was in the same position as you this past summer.
i needed to take this public speaking class in order to fulfill a requirement. but i hate public speaking.
i ended up taking the class over the summer, it was real nice because their aren't as many students in the class as opposed to taking it during the school year.
all i can say is, dont feel nervous, of course you'll feel nervous giving your first speech, but you know what, your not going to be the only one, the majority of the class will feel the same.
after a while, it'll be easy, less nervous. i actually enjoyed that class(gave a speech every class).
i really got to know the other students in the class because we were always interacting with each other.
good luck