I think its about people's expectations being too high. He knows that he will never match up to what he is expected to be. And the 'When you finally trust me I will let you down' bit, is about when he does finally get the recognition and respect of them, that he'll still let them down, because he still isn't good enough. The 'waiting for you' bit is basically talking about how they are pressuring him to be perfect, just like their expectations.
I think its about people's expectations being too high. He knows that he will never match up to what he is expected to be. And the 'When you finally trust me I will let you down' bit, is about when he does finally get the recognition and respect of them, that he'll still let them down, because he still isn't good enough. The 'waiting for you' bit is basically talking about how they are pressuring him to be perfect, just like their expectations.
Just my meaning--