Flirting

Why am I seriously so oblivious to guys flirting or liking me?

I've always been friends with the guys because it's fun to play sports and video games with them and I'll watch Lord of the Rings movies and Star Wars and Star Trek and Marvel movies and so on. But sometimes some person will come up to me after my guy friend walks away and say how the guy was flirting with me, so I usually burst out laughing and then the other person usually gets confused and says how they weren't joking. Sometimes the person is another of my friends, my family member, or even sometimes a total stranger. and if nobody says anything about the flirting and the guy asks me out, I'll assume he was joking and burst out laughing and then usually get confused and surprised if they weren't and feel bad about it but, I'm generally such an asshole that it baffles me to think that anyone could ever like me. And the one person I want to like me either doesn't or I'm still totally oblivious to it. Why does anyone like me ever? I'm a total sarcastic asshole. Why am I so damn oblivious to this stuff?
Why am I seriously so oblivious to guys flirting or liking me?
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