I went for a meeting a couple of weeks ago at Saatchi & Saatchi about a shoot. On the way in I noticed this on the steps into the building... something I'd forgotten!
As creative people we're always reaching for our goals, but often disheartened and frustrated at not being where we want to be, or even that we're just not getting there quick enough! This is normal, in face it's healthy. It's what drives us and keeps us going! Just take some time every now and then to look back at where you've come from. It's only then that you'll realise how far you've travelled.
The important thing is to realise that "nothing is impossible" and if you really want something, you'll find a way to make it happen. Sure it might not happen straight away, and it might not be easy... but then hey, if it was easy, everyone would do it right? So keep at it, work hard, and you'll get there!