One mistake could mess up EVERYTHING.

I have realized I made a mistake ):
It's not a huge mistake,just a small one,but big enough to regret.
I can fix it if I come out and say it.
But I rather not.
If I say it,it could mess every thing up.
I don't want to say it out loud.I just want some help.
Like I said,its not huge like a lie or a felony,just a choice I made.
That choice made a few people hate me.
And I want them to forgive me.
Help?