The quote “we are what we pretend to be” comes from Kurt Vonnegut. Who we are, what we do, it’s all a choice.
The same principle surfaced in my Twitter timeline this week from writer/director Christopher McQuarrie:

Whatever it is you want to become, be it now. For most of us creatives, there’s nothing stopping us but ourselves. You can write, sing, film, paint, dance…for free! There’s nothing stopping you.