Very true. Extraordinary accomplishments all start with an individual's decision to try.
We tend to set the bar very low for ourselves. Then, of course, we get disappointed. Then we blame everyone and everything else but ourselves. Then, with this 'proof' that this is 'the way things are', we set the bar even lower - and 'life' continues.
If you think you can do big things or if you think you can't, you are correct either way. So believe in yourself and set high goals.