I am so bad at doing stuff on time / arriving at appointment's, that this will fail any therapy where I have to arrive physically

Weirdly enough I end up at the opposite end. Before I have a rapport with someone I will worry way too much about being late, so I'll set an alarm earlier than needed and feel internal pressure to be out the door at a time that can account for absurdly bad traffic and I'll usually end up awkwardly sitting in the waiting room for half an hour. Once I know someone will cut me some slack I will be more relaxed until I actually am late for one, at which point I worry about if I do it again soon after it might look like a habit and I'm temporarily back to super-careful. The most helpful thing a counselor ever did for me was forget to show up for one in our first couple weeks, from there out it felt like I get a mulligan if something goes wrong.

If all I have to do is sit in front of my computer then my brain won't let me feel pressed until a few minutes before, and then sometimes distractions happen.