It could maybe be because you're in college, as opposed to high school. You are perhaps intimidated by the idea of being around people who are smart, people who are actually there to learn (probably lol). I'm so sorry honey you had to go through that. It doesn't sound very fun. I think you can overcome it though, you can learn to be less anxious when giving a speech. Actually I KNOW you can overcome it

It's somewhat likely that no one or few people noticed how worked up you were beforehand. It's a good thing to realize that people are more involved in their own lives sometimes to notice what's happening exactly in yours. you can take that as a sad thing, or as a good thing Anyways, you have to feel within you, what it'd be like to be "normal" or not as anxious. You have to feel it in your face, your eyes, your body. You have to take steps in line with that. You cannot act the way an anxious person acts, you cannot act in fear, if you are to succeed. And I know you will succeed. It will just take time perhaps, since this is a new scenario that's obviously presented a new issue to you. But you will do it. With practice I assure you.

And anyways, you can talk to the teacher too, and see if he/she can help you maybe.