How come girls never want me?

Every girl I approach says oh, I have a boyfriend. They can't all have boyfriends and I mean I am just cold approaching them, so they don't really even know me and i know that doesn't really help, but you would think they could give it a chance. I don't ever recall even getting a phone number from these girls unless it was a dating app. Then they give out their number

How come girls never want me?
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