Letting Go

So, why is so hard for us to let go. Not that I have any huge issues that I need to release to the Lord, but rather the day to day micro trials that I continue to try and hold onto, inspite of His past history, in spite of the promises of His word, inspite of what my head knows...it just is having a hard time making that 18 inch journey to my heart...Sometimes I think the day to day stuff is harder to release because we think we can control it...So I am praying that I would change my heart and I would remember that in spite of what I know and what I think I can do (pride) I am really useless without HIm and in HIm I should find all my joy...