Earlyitis syndrome
Earlyitis is when you can't help but arrive way before you're supposed to, even if you're already stressed out and probably made a fool of yourself just for showing up.
I showed up at the party an hour early and just sat there looking confused while everyone else was still getting ready.
I got to the restaurant 15 minutes before my date even showed up. I had time to order three meals and still had time to feel embarrassed.
I showed up at the gym before it even opened. I just stood there looking like I had no idea what I was doing.