If it's just a habit you're into it's not like it's something bad? I guess everyone's anxieties are different but I always make sure to be early as well. It's just being well prepared and a responsible adult? Mine was never instilled in me it was something I learned to do naturally. Especially when it comes to something like the airport. Better to be a bit early and have some time to read a book or mess around on my phone than to be late and miss a flight. Not being critical of you, I get everyone has different mental health journeys, I'm just saying if being late requires planning and stress maybe that's not helping the problem either.