Dude don't try to fit into a stereotype, just be casual, make friends in your classes (start with the guys and then go on to the girls) and make your way from there, you can't honestly expect to go to a new school and be a pimp straight away. That sort of attitude would just turn people off of you.
Honestly, it sounds like you are not being yourself. Which will show through eventually. If you want to get to know all the girls just be yourself and be friendly. Everyone likes a nice guy. Just be real with them. How would you go about getting to know all the guys in the school? It's the same way except the gender is different.