I wonder... why do you expect anyone to approach you? For anyone to lean against a wall and expect the person they're interested in to approach them is delusional. The reality is whether you are a girl or a guy if you want to spark a relationship with anyone you are going to have to take a risk. You're going to have to go out there and start a conversation, or try flirting or ask them to dance. This is not a sex based concept, it applies to everyone.
So if you see a girl showing signals then try to approach her. You might start something. And if you get rejected there are plenty of other girls out there. The same goes for the chicks. If a guy gives me a signal and I don't follow up on it I missed my chance. That's not the other person's fault, that was mine for being a coward.
Stop blaming 50% of the world's population for your problem and face the facts. You don't have the balls to approach girls. It's not their problem, it's YOUR problem. You know, if you weren't such a coward you wouldn't have the problem you're faced with. Girls don't like cowards, so grow a little confidence. Have some faith in yourself, don't wuss out. Get some confidence in yourself and stop giving all the power to the girl. Seriously, girls should be the same way too, they should approach people the are interested as well. But you can't blame girls for your own cowardace.
Courage and confidence to all!!