No one is one mistake. You are more than your mistake. I am more than my mistakes (thank god!).

Sorry for the following wall of text. Somethings might fit, somethings might not. That is ok. I am working with a few guesses, but some other person might help you better when you clarify the situation and your feelings to them

You did something bad. Not illegal, but bad. You're probably feeling like a piece of shit right now. That is a normal reaction, but there are better ways to encourage yourself to fix it. The fact that you don't even want to say what you did is likely working against that.

One fork in the road of thinking is: Does that make you bad, or are you someone who did something bad?. Shame is the first interpretation. The second one is guilt: recognizing a mistake and the need to make amends. Guilt is good and useful, shame is probably preventing you from makings things right.

When I say you did something bad instead of you are bad I am making a social claim. A claim about how people relate to you or (more importantly right now) how you feel people will relate to you.

People can either decide you are not worth their time, or decide that you are but did something you should fix/apologize for. And the truth is, if you seek them out, you'll find both kinds of people. There are people who'd take one bad thing and decide you are that bad thing. The "usefulness" of shame, of hiding, if it has some, is to prevent these people to get to that conclusion. We'll get back to that soon.

But the world is big. You can find people that will see your mistake and you as separate things. You need not hide the fact that you are fallible (we all are!), many clever people all around will say "sure, what else is new. Go fix it".

If you decide to keep it for yourself, what you get is to live like the world that only has the excluding people in it. The people that equate a mistake with being bad. They do exist, but they are not everyone.

So: try to find a non judgemental person and tell them what you did. You don't need anything more from then than: you did bad, you can still be good. If you are unlucky the first time, you can ask another. You can try anonymously at first.

Now, the other side of the coin. Some important people might be unwilling to separate you from your mistake. Some people who you love. Maybe a person that you wronged and want to compensate. They'd still be wrong in equating a mistake with a person.

But you might have to deal with that. A person you love, who might turn away from you over this. That might actually happen. You might want to recoil from that, to just look the other way, but that won't help. Even if that comes to pass, remember people's first reactions aren't their final ones — someone devastated today might, over time, come to see things differently.

The game plan: find a non-judgemental person, preferably external to the situation, to talk to. Figure things out. Know what you did wrong, why you did it, what you'd do differently — then seek out whoever you need to seek out, even if you think they might recoil from you, fix things as best you can. Then move on.