Miserable and want to walk out....

Not my husband LOL but my job! I have a new job and have given my two weeks notice. I quit for several reasons, one being personnel issues. There is a member of management who likes to throw sand and doesn't play well others. They've never made me part of the team, they put me in the back office and ignored me. I feel like I am just getting taken advantage of an abused. I have cried and lost sleep. I probably need to just leave, it isn't fair to me to go into next week miserable because I hate them. I just don't have what it takes to be done, my bark is larger than my bite. I mean why isn't the same termination rules apply? If they were going to fire me, they'd do it without notice, right? I gave them my notice on the 13th and my last day is the 31st.

Have you ever walked out?