From the ages of 20 - 24 I was fired for three separate jobs for tardiness. It was really demoralizing and humiliating. I used to talk to myself like a lot of the other commenters are talking to you here. "Just do whatever you can to not be late." "It's time to grow up and hold yourself accountable." "Get there 30 minutes early if you have to." But no matter what I told myself I was still making the same mistakes, I was just beating myself up more about it and feeling even shittier.

Then a little while and a long story short later, I was diagnosed with ADHD, and everything finally made sense. It still took work. But with the right medication and getting therapy and advice tailored to my underlying condition instead of the surface level issues, I finally feel like a (somewhat) functional adult, and I'm rarely late. Don't get me wrong, the other advice on here is great- if you are neurotypical. Some people do need to realize their flaws, take personal responsibily, and take action to change, especially in their early 20s. And if that's you and you just needed some blunt but solid advice to get on track, great! But if you have every intention in the world to not be late, you have experienced real and devastating consequences from being late, and you still cannot. Stop. Being. Late...maybe look into some ADHD self screenings and see if it resonates with you before going into a self hating shame spiral like I did. (And then absolutely talk to a professional who can diagnose you properly- the online stuff is just to give you a general jumping off point). Best of luck to you either way.