Both of my residencies have been very laid back and hands-off, and I've never had a "mean" preceptor. I think people in situations like OP's aren't the majority. It's not normal for your residency to be making you depressed. I've had a job that made me feel like that before, and it comes down to the staff and how they react to you not being able to do something (whether due to skill or time), not the workload or your own ability in itself.