I'm taking a public speaking class and just gave up within 30secs of my first speech.

I'm taking a public speaking class and just gave up within 30secs of my first speech. It's a required course that I've been putting off until my senior year of university. I couldn't get through the introduction and felt overcome with an intense panic. I said I can't do this right now and sat down. I'm going to try again next week. My professor is understanding and isn't going to take off points for disfluencies. In the days before stuff like this, I just get overcome with anxiety and start thinking about how my stutter has affected me my whole life--all the missed opportunities and the future, etc. At least I broke the ice in from of my classmates and I'm going to practice in front of more people this weekend. I think I'll do better next week, but I just hate how worn out I get from thinking about this all too much. A couple of years ago I had to give a best man speech at my brother's wedding--in front of 3x more people--I got through that by drinking a lot of wine, don't think that's an option this time though.