Whenever I think to beat the approach anxiety, my mind goes completely blank when I see a cute girl walking down the street. I get out of the house with a firm decision to approach girls. But when I see the girls, I don't know what to say. I constantly think the girl might think why a stranger would come and talk to her? My friends tell me that it doesn't matter what I say, but that doesn't help.

I have this weird obsession of trying to sound funny while opening and nothing funny comes up in my mind. So I just avoid approach. Can you please help me on this matter? Please don't tell me "it doesn't matter", because that doesn't help me.