You seem to be misunderstanding. We will not run out of energy. We will run out of cheap energy with high returns. That's what matters.

Our species probably won't discover the stars in the way you imagine. Our existence is already made worthwhile, from the perspective of having an impact. We poisoned our environment and killed almost all wildlife while using up millions of years of compressed sun energy within a few centuries. Unless we somehow find another source of energy on the same magnitude, our technologically prepped up society won't even make it through the next 200 years. Never mind making it off this planet.