Self Doubt

Often times i find myself in a state of self doubt. I know I am capable of doing great things, and achieving every goal I set for myself. There is, however another voice, that becomes rather loud at times. A voice that tells me 'I will fail, I can't do it, don't even try'. This is the voice of fear, a voice I have a difficult time silencing. I am working on self motivation, and consistency, but it is hard when I have learned to doubt myself for so long. It's a battle that stems from within, and I want to overcome this obstacle.