little faith

I just realize how little faith I have now. This is the first in my life that I'm really testing and stretching my limit. It is just the feeling that I can be broken down any of the time. Like the rubber band keep on stretching and finally break. 
I know I shouldn't look at my own limit but to look upon God's limitlessness who will work in my life, work in this path that he has chosen for me. I know He definitely will work it out, I know He will exalt me one day, I know every statements in bible, I know His promise, I know I know.. But knowing it by brain doesn't sooth the burden in my heart. I always know God's love God's plan God's promise by my mind, and only now I realize my brain and heart can be totally separated. They are not always at the same side in every case, at least for now.
I admit I have such little faith in Him. I know I'm not much better as a follower. But Lord, please let me still hold on to your words :

He replied, "Because you have so little faith. I tell you the truth, if you have faith as small as a mustard seed, you can say to this mountain, 'Move from here to there' and it will move. Nothing will be impossible for you." ( Matthew 17:20 )

It is you who given me this promise. I really have no idea what other efforts I can give to achieve a better result. I had given everything in. Lord, uphold me even I have little faith. Nothing will be impossible if I have this little faith in you. 

Dear Abba Father, I call upon your name and beg you, listen tentatively to the prayer from your precious daughter.