I had some years of definite frustration. Auditioning and not working as much as I would have liked to, or working and being paid a pittance, and sort of scrounging by in New York and sleeping on a chair that folded out into a bed.
I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.