My dad says I’m being too dramatic about what’s going on at work. I don’t think I am. 

Started my second ever part-time job in February. I’m working in the clothing section of a small store that also sells home goods and food. I like my job and all my co-workers are nice. My boss is nice as well but he is very disorganized and forgetful. I am a university student so I can only do 20 hours a week, which I have told him many times and written to him about. Last  week my supervisor (who started at the same time as me) quit. This on top of at least 13 people in a month. He asked me last Thursday if I can do more hours because of that and I told him no I can only do 20 hours because I am in school. He said ok not a problem.  He asked a few other people as well but everyone said no as they are in school too or already full time. Yesterday, I checked the schedule and he has me scheduled 32 hours. He didn’t change anyone else’s hours. This isn’t the first time he does this to me either. The first time he had scheduled me 8 hours more and when I told him he said i was actually only working 24 because of breaks. So I worked 4 hours more. Then second time he has scheduled me around 14 hours more and he changed them but still I worked a little more than 20 hours. I don’t get why he went ahead and added 12 hours this time after I said no or why I am the only one he did that to. I also am angry because my other coworkers call in sick all the time or leave early but when I asked to leave an 1.5 hours earlier for school he didn’t answer me yes or no and I ended up having to work. I have never called in sick, left early or came in late. I have however worked when I wasn’t scheduled and came in for shifts earlier because we were understaffed. 

The second issue is the workload. I am expected to take care of the changing rooms, fix up the clothing area, help at the cash, open up boxes, put clothes on hangers, put clothes on racks, answer the phone, get the returns and put them back where they belong, help customers and do price checks. This isn’t a problem when we’re like 3-4 people as the work is split up. Problem is on a certain day of the week I am alone for 5 hours of my shift and my boss doesn’t care. Yet when other people are alone I am always getting called to come in because we are understaffed. My coworker who is the oldest one in the clothing and the most experienced has told him and even HR that he demands too much  and that’s why too many people are quitting. 

I don’t understand my boss. He always over schedules me, he puts me at the cash when it’s not my job and I told him I’m not comfortable there. When someone else is alone working  he makes sure there is always someone with them. Yet when I work on a certain day of the week I am alone for 5 hours (3 of those are peak time) but everyone else is alone for 1.5 hours (the last hour when no one comes to the store.) 
I’m really thinking of quiting. I don’t want to but I don’t know what else to do. I’ve only been there for 2 months. I can’t do the anxiety anymore. Thinking about the schedule gives me anxiety. Thinking about why i am left alone and why I am given hours I can’t do gives me anxiety. My dad says I’m overreacting but I feel like my boss doesn’t care and I will continue having anxiety. It’s gotten so bad I can’t sleep the night before and I feel so sick when I go to work.