Don't understand what I'm feeling after my first hug, what's happening to me?

Yesterday I got my first hug from a girl who ain't my mum. It felt intense and mysterious. I don't know how to control my thoughts and feelings because I enjoyed it and had a weird feeling at the same time that I can't explain. What's happening to me (I'm 23)
Don't understand what I'm feeling after my first hug, what's happening to me?
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