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There is another layer. You are not only trying to travel through space, but also time.
We know the formula:
s^2 = (ct)^2 - d^2s: spacetime distance/interval (invariant no matter the observer)
c: speed of light
t: time
d: coordinate in 3D space
Now, let’s say we have 2 travelers who need to meet at a certain place. Traveler A is 1 spacetime distance unit away Traveler B is 2 spacetime distance units away.
If they are both at the same age when they started the journey, B would be younger than A even though A is closer to the destination than B! Because B experienced more time dilation, and A needs to either wait at the destination, or travel slower.
So to meet each other at a relatively same age, B needs to travel slower on purpose, or A can take a detour.
Millions of years become meaningless, people who have no spaceships would be a death sentence. They would never see loved ones again. So in a sense, enormous ships that can travel at near the speed of light are a norm for that type of civilization.
We are unfortunately at a very early time of the universe. If we are born later, we could probably see other civilizations travel to us :D
Space travel is weird. Brain hurty.