Bad days

Today is not a very good day, in fact this week has been horrible. I am trying to stay positive and keep my head up and trying to work on me, but with the job I have it is very hard. At the end of my day from work all I want to do is eat feel good food and cry my eyes out. My managers at my job make me feel like I am a complete fool and that I cannot do anything right. Some days I just want to run far far away and never come back. I would love to just get up and walk out, but I have to responsible and need to pay my bills. I need a change. I need to find a new job. I am trying the best I can, and I work very hard. but Today I just want to cry. How do I keep motivated? How do I keep staying strong when all I do is get kicked down? Anyways just needed to vent for a second.