Can you make a mr.right out of mr.wrong?

How much patience do I have to give to a bf i know isn't the right one for me. Is it right to say that you can make Mr. Right out of Mr. Wrong?

You are wasting your time, just like a lot of girls do.....it ain't gonna happen, so get over it and move on.

Trying to "make" someone be who/what you want is a waste of time, and it's frustrating to both of you. All you'll do is piss him off, and disappoint yourself - best to just move on.