Part of being neurodivergent is constantly getting mocked and teased for wearing out easier than neurotypicals. Where they can fit several different activities into a day, I'm exhausted before I've even finished the first one.
It's because so much work goes into masking. Talking to people in general, let alone when I don't actually want to, is exhausting in itself. Even the brightness of the sky can be overstimulating at times, and that's before I've done my shopping or done what I need to do, where there's too much talking and excessively loud music and workers who are often pressured into getting into your space before you've even walked several metres through the door.
What is considered background noise to some people is all I hear. I can't openly stim or do the things that make these jobs bearable because I'll get those looks from people that remind me that I'm not actually welcome unless I can be "normal".
I have to remember the script that I've created in my head for when I talk to the person I'm seeing. If they stray from what I had planned, I then have to create a new script on the spot without them realising that I'm on the verge of an anxiety attack because it's not going as I had hoped.
I have to make sure my facial expressions don't slip into what's natural, because it looks like i'm bored/disinterested. I have to make sure I'm making eye contact on occasions even when I don't want to because it's seen as disrespectful/impolite. Nobody wants to accommodate my needs more than they absolutely have to, but I spend every hour of every day - sometimes even in my own home - accommodating the people around me.
So yeah, small things can be exhausting.