Seriously dude, girls aren't that awful. On this dance, make it your goal, no matter what, to introduce yourself to at least 5 girls. Don't worry about after, just introduce yourself, ask their name, then say "cool, nice to meet you, i'm gonna get back to my friends now". The first time will probably be hell, until you say hello. If the girl doesnt wanna know, who cares? She probably wasn't a very interesting person anyway. But, yeah, do that 5 girl thing, don't worry about "success" or "pulling", make sure you enjoy yourself. Just introducing yourself shows you aren't afraid and are comfortable and happy. Enjoy!