Is it normal as a man for girls to NEVER flirt with you or express interest in you?

Basically I've been at college for 2 years and not one, legitimately not even one, girl has expressed any form of romantic or sexual interest in me, or flirted with me. There were a handful of girls who I at one point thought were flirting with me, but every single one of them turned out later on to have boyfriends. Basically I haven't asked a girl out since I was in high school, I'm now in my 30s, and the main reason is because girls never, ever show interest in me. Therefore I've concluded that I must be repulsing women in some way. For this reason I never flirt with girls, never touch them unless absolutely necessary. If I really like a girl I sometimes even go out of my way to never make eye contact with them or smile at them, because I'm scared they might think I'm disgusting or pathetic.

Is this normal? Am I just crazy? Or I should I be worried that literally no girls show signs of interest in me

Is it normal as a man for girls to NEVER flirt with you or express interest in you?
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