How do I stop being insecure about my penis size?

I'm 21, and no matter how many articles I read or documentaries I watch, I still feel like I'm less of a man because my penis is small, 4 1/2 inches hard. I keep reading articles that women don't care about size and it's just a myth and my size is just fine. But every girl I've shown it to seems so disappointed? Is it because I'm tall and they expect more? I don't know. But I feel like less of a man cause of it, and my confidence is nonexistent.

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