Help! How can I change from being a really 'nice guy' into a 'bad boy'?

I know you said don't said "be yourself" But please! Listen, if you do change into a bad boy you will get all of the wrong girls. You will not be comfortable being with someone who doesn't even know who you are really like. I always go after the nice guys. I just don't think you are getting noticed. Do something so you can get noticed but please do not change. I hate bad boys. I wish they would all just get a life.