motivation&writing

Often times, I feel absolutely no motivation. Some days it's all I can do to drag my lazy self out of bed and just get on with the day. Even once I'm up and about it's still a struggle. 
...But this how I know I'm supposed to write: even when I don't want to get up and deal with the whole " existence thing" I still have the desire on my heart, push, and love of writing. For somebody like me -- who feels numb a majority of the time -- having any such motivation is a huge gift. So how ungrateful is it of me that when I am given a bit of feeling and motivation I still neglect it. I think "Oh, I won't write anything good enough... I don't wanna rework my short story... or poems...or blog...meh"
He has put the desire on my heart to write. It's that simple. And all of the thoughts of not being good enough are clearly wrong. Why would He call me so strongly to something unless I could somehow do it? Hmmm.
It reminds me of some Beartooth lyrics "Give in you know it's your purpose even if you know you'll never deserve it." Yup. Perfect. My pre-med roommate and I talk about this all of the time -- there is so much work involved in living up to our calls. She often wishes she had an easier one, but she knows this is God's plan for her and so nothing else in this world will satisfy her heart so. As for me, I often think "There's no way that He could want me to do X,Y, and Z... no way." But then why has He put the desire with in me? I could never deserve to write beautiful things, but if He will do it through me, let it be done according to Your will.