My naturally wavy hair will not straighten?

I had your exact problem myself :O But then I asked a question like this & someone recommended John Frieda 3 day straight , it cost me 10 euro and I got it in my drugstore :) I used it and it's amazing ! Basically what you do is , after washing your hair , spray this in your hair , then dry it & straighten it & you'll notice the difference , it says it lasts 3 days without straightening , but I think mine looks best when I do straighten it. Hope I helped ! :)