Quitting: Is it ever OK?

Ok, so I decided to do a post about something that I've been dealing with recently. I take an acting class at a theater in the city once a week, and we get assigned scenes and scene partners by the teacher to work on extensively until Jan. 14th when we present them. I was given the role of Frankie in "Frankie and Johnny in the Clair de Lune". I also was assigned a scene partner, who'll I'll call...Gary. Now I'm guessing most of you aren't familiar with the play (I wasn't), but it's about two middle aged people who work in a diner, and after sleeping together on the first date, experience very different results than what they expected to. Johnny is forwardly in love with Frankie, and is in no way ashamed to tell her everything that pops into his head. Frankie is very different. She's been abused in past relationships, and while she has no problems with sexual intimacy, she pulls away hard from Johnny praise and adoration.
Here's where the problems come in: my partner creeps me out, and in class (which is supposed to teach us how to make scenes more realistic), we had to do several exercises that made me EXTREMELY uncomfortable. So do I listen to how I feel and leave the class, knowing that while I was unhappy in the class, I basically quit, and that in my career I should be able to push through and challenge myself.
I ended up talking to my teacher, and we did several things to help me be more at ease in the scene. I'll still never be 100% happy with it, but I feel like I have to stick it out and make the absolute best of it. So while I know that if I did leave, no one would have thought me any less, I would have always looked back and maybe regretted it.

That's all for now, I'll post tomorrow after the National Geographic shoot to tell you all the dish! MUAH