I didn’t read all the above posts so I hope this hasn’t been said yet.
I think that we sometimes we get so caught up in the idea that “davening is for us” that we forget that this doesn’t mean that we should be at total liberty to decide whether we want to do this good thing or not.
Think for a moment before you start to daven about how much you appreciate everything Hashem did and does for you all the time. Take a minute to reflect over and remember how much you owe Him and how much a part of your life He really is, even when you’re not paying attention. He has kept you alive until now, he provides for you, He has given you a loving family… for everyone it is different, and we all have millions and millions of things to thank Him for. Just think about a few of those things, or one or two or three broad categories, and then start to daven. This helps me sometimes when I need to just try to pay attention. It helps me realize that I owe Him so much so the LEAST I can do is give Him a good davening, and show Him that I do know it’s all from Him.
It’s a real avoda though, good luck.