But How?

I'm a newbie to this site (just joined today actually), so excuse me if I'm totally off subject or .. I don't know. Lol. I kind of don't know where to begin, but I know motivation is the biggest thing for me, so I gravitated toward this forum.

I was just wondering.. how do you guys stay motivated? Like.. *really* motivated? I have my moments in the morning, where I start optimistic and say "it's a new day, I can do this!" .. but as the day gets on, I just start to falter at my diet or workout goals, and by the end of the night, I have binged at work and feel all gross and bloated, and think to myself "tomorrow will be different".. with the same cycle.

I have the motivation in my head, I guess.. I want to get healthy and in shape. But, lately I'm having trouble really keeping it up, and keeping it to the point of where it's actually going to be a factor in how I live my life. Does that make sense?

Basically, it crumbles down to: I have terrible will power