Got a job right out of college, but am depressed about it?

I like the work, but it can be depressing becuz my supervisor isn't very nice and it makes me feel incompetent, I have been working here for 3 weeks already. It's not a particularly friendly place and I don't feel valued as an employee. There are not many women either. I know that not all jobs are like this. Is this how jobs can be expected to be? Should I just stick with it or find someplace else to work? What should i do? I am thinking about getting a part-time job working with children to see if I want to teach instead- does this sound necessary?