2 advices:
1: read this:
kiss-the-cockblocks-ass-vt144094.html?highlight=
2: To have the girls interested in you at party's you gotta be the guy of the party. How do you do that? Simple. You talk to everyone on the party INCLUDING the guys. What does this do? It shows that you have social proof, that you know people, that you can connect with people. The girls notice that all the guys have fun around you, and they want to be part of that fun. BOOM! Then isolate a girl you like, have private time, make out, take her home with you and BOOM! -> sex. Naah, that's not always the deal. But seriously you get the point right?