I hate work so much!

OK i know i moan about work a lot but I just hate the place after last weekend! I went into work last Thursday and went upstairs to look at the roster for the week. When I started working in Dunnes I told the manager i couldn't work on Mondays and Thursdays due to late college lectures on these days. She accepted this and said that it would be no problem. Ironically I always find myself working on Thursdays. I'm never in on Mondays. As it's my birthday on Monday I assumed I would not be in. However I looked at the roster and found I would be in 6-10 on my birthday! I then looked at the rest of my hours and I was supposed to be in 4 other days. It seemed like the minute I turned 18 I would be working more hours than I agreed to work when I signed my contract. I was livid. I went down to the manager and asked why was I in work on Monday and she simply said "because I say so". I told her I was swapping hours with someone and she said that if I didn't find anyone to swap with me I would have to work. Eventually one girl obliged to help me out so in turn I would be working on Thursday for her. I had no problem with this. Then i realised i would be working Wednesday, Thursday, Friday, Saturday, and Sunday. I would also be working till half 11 on Thursday and Friday. I was really looking forward to turning 18 and all of a sudden i wished i was 16 again! So in conclusion I hate Dunnes Stores even more than I hated then last week!