To change for the better?

I have been thinking of changing my image forever. I am 17 and most girls I know, know me as a "sweet and nice guy". My best friend is what I call a "bad ***". Now when we are together, we are both equally "bad ***" but separated I tend to care a lot more for girls. As in, I would listen to their problems and help out. He wouldn't do anything of the sort. But he seems to get more "action". Now I don't actually think "action" is a good thing for m because I think a serious relationship is better but I turned desperate. Now there is a girl ( a close friend) I love, who I don't know what she thinks about me back. She wrote in my bday card, " I can't believe someone like me ever met someone like you". But according to my friend, That's just a trick for me to be "in servitude" to the girl as a cushion for her problems and that she would never look at me the way I want her to. I tend to listen to my best friend because I always envied his success with girls. I tended to be the straight, mannered, caring guy with good grades and he was the party animal, drinking, doing drugs , treating girls badly, and failing cles. I started to get an "unloved vibe" and I asked my friend for help. he promised to help me out. He said girls only like "es" and that to be loved is to become one. His idea was that girls only like nice guys when they have had all their fun with 50 "es" and are no longer young and want to use the nice guy for financial security. This got me sad because I wanted love too and I asked him to change me up. Under his supervision, I lost about 50 pounds, gained a 4 pack, learned how to fight, and started to treat girls terribly. Many of the girls I used to be friends with missed me because I wasn't there to be the friend that I used to beHe convinced me that, for my happiness, it was best to treat em badly. I lost my straight edge ness because he said drinking and drugs would attract girls to me. Sadly, it did. Girls I never knew started to like me. I felt bad for losing my morals, but I finally had the thing I wanted the most, some actual affection.