feel abit down

I just started my new job this week and already I hate it, I am doing 4 x 12.5 shifts and not even getting 300 a week, I have to pay 30 pound on trains, they forgot to give me my last lunch break and when I mentioned it they said apparently it's too late to take it now. I was told in the interview it was 3x 12.5 and when I asked could I change it to that they said they'd think about it. They have me doing manual handling with no training and after my first day told me that they'll have me being hands on and doing the work they want me to. I want to leave and go somewhere else but I'm afraid my partner will have a go when I've just started. 5am rise and not home until 10 that night 4 x a week seems far too much