The bible is still wrong?

Ok the bible created the earth on 6 days, than he created Adam and Eve. ONLY THEM NO ONE ELSE, THERE IS NO SAM OR NO ADAM NO CINDY NO.... IT JUSTMENTIONS ADAM AND EVEN.... anyways Adam and Eve have two sons, Cain and Abel. Cain kills Abel when God rejects his offering and accepts Abel's. Cain is then cursed to wander, and he founds a city and a lineage. He eventually marries a women and have children. now, where the F**k did this city and this other peopel come from, didnt the bible just said he created Adam and Eve (2 people) than had 2 children (4 people) and where did the city and other people come from? the bible is so wrong and contradicts itself. explain