promises, promises, promises.

When will i keep my ownpromises? I keep promising myself im going to change, im gonna start taking these vitamins, start eating, getting fit, gaining healthy weight, eating better, i promise myself all these things and yet i cant follow through. Im so useless, people make it seem so easy. My life isnt as easy as it use to be. I want to change, i want to do better, but i feel so weak and ashamed of myself. Am i a fuck up?