Shy guys, what goes on in your head when you realize you're developing a crush on a girl?

What happens when you realize you like some girl? Does your attitude suddenly change towards her? Does it freak you out?
Does it make you jealous if she's good friends with other guys?
How do you plan to pursue your crush?
Shy guys, what goes on in your head when you realize you're developing a crush on a girl?
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