Was my supervisor being a jerk, or am I too sensitive?

I started working at a u hual 3 days ago. I've been learning on the computer how to make reservations, and stuff like that. There is a lot to remember, and I'm completely overwhelmed. Well it was slow so i was standing behind the counter looking at the computer, when my supervisor comes up to me, and is like, I want a trailer! What do I have to do? I knew he was testing me. Then he was like "what's taking so fucking long? I want my trailer now!". I was just so caught off guard and felt so much pressure that I just froze, and couldn't think. He eventually stopped acting, and was pointing at the computer where to go. He was talking with a very frustrated tone. It made me just want to quit, because another co worker was there, and it was kind of embarrassing, and it just showed how little I know. I just don't want to even go back on Monday. I don't think it's the job for me.

Was my supervisor being a jerk, or am I too sensitive?
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