How do you not relive your bad speech moments?

How do you not relive your bad speech moments? Today in class, I got called on and my pace was fine because I rehearsed the lines in my head but then I stutter. I took a deep breath and tried again. But I couldn't say the word and I couldn't come up with an alternative word. I kept embarrassingly sounding it out and the class was dead silent. Eventually the teacher had to come over to my seat and read for the class what I wanted to say. I just hated myself and felt so pathetic of myself all day. I'll admit, I even cried about it at home. How do you not be harsh on yourself when moments like this happen? \*my teacher is really nice btw so please don't hate them. it's just that I'm the problem.