If a guy doesn't know what to say to a girl is that a sign of low confidence?

Anonymous
I don't normally approach girls but the reason for that is because I don't know what to say to them after I approach them. I can go as far as saying "hi" or "how's it going?" but after that I'm pretty much stuck. I know that's hard to believe but it's true. I can say "hi" to pretty much anyone but making conversation is the hardest part. I don't know how to make conversation or even how to make a conversation flow. I guess that's because I don't know what to say to a girl to spark any romantic, but I can very easily make friends through conversation. Is this a sign of low confidence?

P.S. Does walking up to a girl and saying “hi” actually work?

If a guy doesn't know what to say to a girl is that a sign of low confidence?
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