I got jerked around at first too. I had to do two rounds of seasonal, one doing local work, one doing linehaul work.
I made $35k the first year where I was mostly seasonal, 50k, 55k, 88k, 90k, and I'm probably going to be in the 100-110k range this year, and I'm not killing myself working.
I'm making good money now, but it took a while to get here. It completely sucked in the beginning, but it was worth it in the long run.
Human resources is there to sell you the world, and in the long run they are right. It's the last job you'll ever have if you stick with it. But there is a serious hump to get over in the beginning.