Yes, there are many creation myths (both ancient and in our modern time), but Genesis isn’t one of them. It’s actual history. How do we know? Well, here are just a few reasons:* Genesis uses the same structure and writing style throughout the entire book. There’s no break between the early chapters and Abraham—it’s all meant to be taken the same way, as history.
There are intentional breaks. Just not where we put them. Look for the phrase "these are the generations of..." as the start of a distinct section.
It is also useful to know that Genesis 1 and Genesis 2 were written by different authors at different times. And Genesis 2 is the earlier of the two, although they were transposed later when the Tora was compiled.