I need time management skills

Managing time is something that I desperately need to learn. I can' get a handle on my everyday tasks let alone all the other things I try to fit in. I just want to do it all. I find that by me wanting to do so much I often fall short of all the little things. Spreading myself thin is what I've been told. In all reality even when I take away some of the things on my agenda I still end up with little to no time to fully complete any one task. I know it's crazy of me to think that I can do everything and be everywhere but I still find myself over committing all the time.
How do people get so much done in one day? What am I missing?
I have tried numerous "get organized" techniques but so far none have worked for me. I am on a mission to finding a method that will fit with my personality. So far I have tried making lists. I have tried scheduling blocks of time for my intended to do list. I use my google calendar on my phone to write down all my tasks for the day. I even use the alarm to set timers so I don't forget. The other problem I have is staying focused. I start and stop so many things that I rarely finish them. I get easily distracted and then I'm off trying to do something else. If anyone has any ideas on how to manage my time and stay focused I would love to hear them. Until then I will be all over the place