For your Target job, any job with multiple supervisors is awful. No matter what you do, you're always going to piss one of them off, because they all have conflicting demands. My friend worked at Shopko for a couple weeks one time. He was in the electronics department, and that supervisor told him not to leave no matter what. Then the general manager comes and chides him for "standing around" and tells him to go do something else. Then when my friend got back, the electronics supervisor chewed him out for leaving the department.
As for your second job, since you seemed to like it, I doubt you actually had a depressing demeanor. Employers are idiots. They can regard anything that's not Stepford wife-like as "depressing". Did your boss say it was having a bad effect on business or anything? I doubt it, because it wasn't. As long as you're quick, efficient and aren't a dick to people, 99.9% of them aren't going to care if you're not constantly smiling (or even smiling at all). This cashier at my local grocery store obviously hates her life, but it doesn't stop me from shopping there! Yeah, like I said, employers are idiots.
Since you're actually able to find jobs in these dark times, I'm sure you'll find something soon enough that isn't horrible.