Why don't girls approach guys they like?

I am 26, when I was in High School most girls were never scared to approach a guy they liked. Now a days thats not the case I’ve noticed most women will stare at a guy but will never approach them. It happens to me pretty often. I guess they are waiting for the guy to make the first move. Most women say they do so due to fear of rejection. Sometimes I look back at them, but they just look away.