Should I stay or should I go?

So I recently have been working at retail (a teen clothing store) in the mall, and it's so far been pretty tough. I work on the floor (greeting, folding, dressing rooms). There is a strict image/environment standard that goes onto the floor and I didn't realize how perfect each fold, stack, etc. had to be. My manager is intimidating and I am always nervous when she comes to see my work, and if something is slightly off, she will tell me. I think it's cause I'm new and she's giving me a trainers attitude, but now I see why so many kids at my school who've been hired before have quit this job early. Should I stay, or leave like the rest of 'em?