continual failings

I am really struggling with even the infantile steps involved with becoming more spiritually disciplined. It is so difficult for me to quiet myself before God and learn what it means to listen to His voice. I live a hectic, busy, non-stop life and when I finally do get time to myself, there are so many other things to occupy my time, many of them worthy in their own right. I am perpetually frustrated with my inability to take time to engage in meditation and prayer as I realize that it really needs to change if I am to see any spiritual growth. My job is stressful and takes up a total of 11-12 hours of my day because I work 3 split shifts a day and I try to run the rest of my life on my breaks. I feel so scattered and that I cannot possibly do all the things that are asked/required of me and maintain my sanity. Things need to change, but I don't know how to do it without if affecting my job perfomance as well as my relationships. Oh my...