Feeling of inferiority?

I am an average looking 20 year old guy. I think I am suffering from some mental disorder because of which I start comparing my self to almost every single man I meet and most of the times the comparison is between looks. And i find that person more handsome and charming than me most of the time and start feeling inferior. I feel like I m not handsome enough or this guy can easily steal my girlfriend so i get insecure about myself.
What do you think about this, please do share your thoughts.
Feeling of inferiority?
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