Is it illegal?

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@ my Job I am Part -Time I decided to turn in a availability form because I had decided to continue my education. My boyfriend gets off @ in the afternoon and I don't want him to wait 2hrs. So in the beginning my schedule was set and I had no problems my manager and supervisor made it able that one of my co works who likes working in the afternoon worked for him great and that was awesome. I wanted to work mornings and that worked awesome for me. Let me remind you we both are part time. This continue for months.. Then my supervisor said it doesn't work and don't think it's good idea that we have to take a lunch when we are here if we are here for 5hrs. Well yeah I try to turn in a availability form because I wanted to continue my education and just my life outside of work didn't work. I try to explain that both to my supervisor and manager. They switch it for a week.. Then.. Try to out it back.. My manager wanted to talk to me and said that there is no availability form and that.. The branch hours are base on the branches requirements and needs. I told her I that I plan to continue my education and that should matter because it's not going to fit.. She looked at me and said sorry. So I told her so my life outside work doesn't matter she said.. We are not saying that I said well you are showing it. So I guess I can't continue my education because I bound to my job... Is this even legal???