Do you know what "assume" means?
Let me show you:
Ass + u + me

Imagine who you want to be and then step towards it. Dream big and then do something. Anything. The simple act of moving at all will change how you feel about the entire process and serve to inspire you further. Let go of the imagined result; it is not necessary. The fantasy and the dream are merely tools to get you off your ass. It doesn't matter if they come true or not. Live, man. Just live. Stop trying to be happy and just be.

The definition of happiness is "the moment before you need more happiness." As cynical as it is, the brilliance of this line lies in the fact that we rarely notice happiness while we are experiencing it, we only notice a lack of it once it is gone.