Socializing is always draining. It's a physical fact that it simply takes a huge amount of energy to engage with other people, no matter what you think your personality type is. Dealing with socialization is a big part of why we have these huge energy-intensive brains.

I think the discussion here suggests it's an issue of perspective. Is socialization a fact of life, or is it something you are allowed to opt out of?

It's okay to be tired. A day that leaves you exhausted should be celebrated and followed up with rest to prepare for the next day!