You're at a networking event or a dinner party. On the outside, you look perfectly fine. You are nodding, making eye contact, and asking appropriate questions. But on the inside, you are running an incredibly intense, high-stress control panel.
Your internal monologue sounds like this: "Make eye contact. Not tracking, that's staring. Look away. Okay, look back. Stop tapping your foot. Are you talking too loud? You're talking too loud. Shut up. Wait, did you just interrupt them? Apologize. Okay, listen to the story. I'm bored, but look interested. Don't bring up that random hyperfixation. Smile."
Welcome to ADHD Masking. Society rewards you for this behavior because you appear compliant, polite, and "normal." However, the biological cost of this performance is staggering. Neurotypical individuals socialize using automatic processes in the brain that require very little energy. For an ADHD individual, suppressing hyperactivity and acting neurotypical requires the constant, aggressive activation of the prefrontal cortex (executive function).
When the event ends and you get into your car, the mask drops. The sudden release of the massive cognitive tension leaves you completely hollowed out. You cannot speak for the rest of the night. You cancel your weekend plans because your nervous system is vibrating with exhaustion. This is not just 'introversion.' This is a severe neuro-metabolic crash caused by forcing your brain to operate in a language it does not naturally speak.