Yes, but as long as we don't self-destroy, I'm pretty certain we'll master it. The achievements of humanity are already remarkable. I mean, being able to split atoms and safely harness the produced energy is pretty incredible. Fusion, which seems impossible in many aspects, is closer and closer to our grasp every day. I am convinced that interstellar travel in a reasonable time for humans will be achieved eventually. But of course not in our lifetime, far from it.