That is not how reality works.
How the fuck do you know?
I am an adult. Not a child living in comic books.
You can't magically just be in some time before you were born.
The idea is nonsensical gibberish.
To get to a time before you were born would require going there.
You can't just magically be there.
And it would mean going to time that already passed without you.
So you going there would change it.
Not necessarily. If the block time hypothesis is correct, it means going to a time you always went to.
Going to see a dinosaur means going to a time that has passed already without you there. A time before you were born.
If it passed already without you there you could not have always been there.
If you go back to the age of dinosaurs it will be the first time you do that.
That's an incoherent statement in the context of time travel.
Translation: It shows your ideas to be nonsense and you can't deal with it.
You did not live in the time of dinosaurs.
Their time has come and gone without you.
If you somehow go back to the time of dinosaurs it will be the first time you go there.
You have never been there before.
If their time came and went without you once your miraculous presence would be a change to the past.
Impossible.