Boyfriend wants me to be more positive...

Let me start out by saying I am not happy where I’m at in life right now. I’m always tired, stressed with school, and work a shitty job with rude people. I feel my negativity does stem a lot from my job because I dislike all but 3 out of the 11 people I work with and I hate the position I work. I stay because I can’t afford to work late hours with my classes considering I was already struggling this semester with homework and finding enough time to get things done when getting off at 5 everyday. Despite all the shit this job has flexible hours and no set schedule, which I feel I really need right now. My boyfriend just can’t understand why I would give up my happiness for a job despite the fact that I’ve told him all of this multiple times. Every once in a while he will tell me I’m so negative and I need to be happy and content in my life. I am happy throughout the day, but I do agree I let small things get to me too easily, but I do it without even noticing, so is that just who I am?? I know I should be more positive, but given everything I’ve been through the past few months and even year I really just don’t think being positive 24/7 is possible. He says that I complain a lot, but really I’m just telling him what happened during my day, and not a lot of it is good things honestly, but I’m not dwelling on the bad things, just talking about my day. So I guess I can’t tell him what happens during my day anymore, which I feel pretty upset about. Does anyone have advice for being more positive or changing your outlook and attitude??