Trying to be better

So this past few weeks I've noticed that I haven't been very happy. I haven't been sad but just not extremely happy. None of my mini plans made me happy or my big plans were working out. So I did a bit of soul searching and of course as always it was because I wasn't praying or doing my personal scripture study. Why is it that it's always the reason?? I mean I've changed to try to be better before and then when I feel good I stop. Too bad I can't learn from previous mistakes and just stay strong. I'm trying this week to be good and pray but scriptures are what I struggle with...I'm not sure how to motivate myself. Any suggestions????