I think you might be
You and I, we run the same race
Though I'm always one step behind
Yesterday is one day (step) behind in time.
I might try to tempt you to slow your pace
But keep your eyes forward, it's fine.
By focusing on yesterday, you can get caught up in nostalgia and regret. One should really look to tomorrow.
That said, don't ignore me completely
My actions should serve as a guide
It is important to learn from what happened yesterday.
Try your best to do better than me,
But if not, well... at least you tried
A person should always try to grow from the day before.
As time moves on, yesterday becomes further away.