Introverts don't know how to relax and have fun.

Introverts typically relax at home or in nature, not in busy public places. Introverts are not thrill seekers and adrenaline junkies. If there is too much talking and noise going on they shut down. Their brains are too sensitive to the neurotransmitter called Dopamine. Introverts and Extroverts have different dominant neuro-pathways. Just look it up.