Ambitious but lazy: anyone else struggling with this phenomenon?

I'm a very ambitious person, sometimes to the point where my life goals seem a little unrealistic to people, even to myself. HOWEVER, I struggle massively with commitment and so end up spending substantially more time fantasising about these goals then actually working to achieve them. I defo feel like this weakness of mine is holding me back from achieving anything I might have the potential to achieve.
Does anyone here relate?