If you do not want to be late, then do not be late! It is up to you.
Plan ahead, if you do not want to be late.
Make a plan with a timetable. Visualize it in your head. Your leaving at exact time.
THAT (whatever you are doing now, instead of what you should be doing) can wait. Now, move!
You have made a plan. And a promise. Intention.
Intend to be on time.
It is that simple. Millions people arrive on time every day :)
From now on, you will be/are one of them. Say it:
I will not be late. I intend to arrive on my destination on time.
Or just use an alarm clock, and have it ring continuously.
But seriously. You can make it/be on time.