Most probably yes, I mean we only have few generation of stars actually producing heavy elements enough to see what we see ie on Earth, not just some hydrogen & helium ball.
Also most probably there isnt any way to travel back in time, since we would most probably be eliminated at the seed to not compete for resources or avoid aggression. For all wonderful things mankind did and does, we are still deeply flawed and highly emotional primitive beings, and we may kill ourselves due to this.
On cosmic scales of time, theres no reason to assume spacefaring humans would remotely resemble us in any recognizable way. Imo especially their minds, they’d almost certainly have augmented and modified their thinking drastically.
Also most probably there isnt any way to travel back in time, since we would most probably be eliminated at the seed to not compete for resources or avoid aggression. For all wonderful things mankind did and does, we are still deeply flawed and highly emotional primitive beings, and we may kill ourselves due to this.