The pain of believing in an inherent environmental limitation and an inability to experience our desires and dreams is akin to being able to walk but convincing ourselves our environment limits us from doing so.
The only reason we do not believe in our inability to walk but do believe in our inability to dream is because the cessation of walking would be too immediately painful while the pain of ceasing to dream is not immediate and has been dulled by becoming normal.
Believing in our limitations stems from a belief in our own alienation. It all comes from the belief we are a cosmic accident that just happened to come into existence in a cruel, harsh, unflinching Universe. It is all about convincing ourselves that our environment is not suited to us, which means we must struggle against it for survival. And when the struggle is too great, as we believe it would be if we followed our dreams, then we must give up our dreams and instead protect ourselves from this bastard of a Universe.
This is something no other organism believes. The reason the organisms of our world do not succumb to stress in the way we do, even in the face of their own challenges, is because they know they belong. Their actions spring from a sense of belonging, which naturally reduces stress levels. They exude a sense of grace.
The irony is that most of the challenges they face- the ones we point to in our quest to prove our belief in a life of struggle- are predominantly the result of mankind playing out its own sense of alienation. We seek to dominate them and the world so that we can feel that we have staked our claim to the world, and that we have won against the cruel forces of nature.
If we felt a sense of belonging to our world, we would seek to express our true desires and our dreams, but those desires would include the thriving and fulfillment of other human beings and of the natural world we live in. We would see that the world is suited perfectly for the experience of our desires and our dreams. We would see that the world is us, just in another form. We would finally stop being aliens in our own world.