I agree. To an extent, evolution does happen. Over time, species do adapt to new environmental challenges.
But as far as if humans and monkeys shared a common ancestor, I really can't give an answer other than God's plan was fulfilled. If in our creation, he took a shortcut and caused us to evolve from primates, then that's fine by me. I'm here today, and God is the reason. The truth is that there is no surviving evidence from that time which has ever been found, so we will most likely never know.