I almost did the worst thing possible.
Could you explain to me what you did that you feel was so bad?
I almost shot one of my friends at the party.
It's understandable that you are troubled by your actions. It's important that you learn from your mistake and not repeat it.
I'm not scared, I almost shot him because he annoyed me.
You need to learn from this though, because it sounds like it was extremely scary for you. Don't let your emotions take control and allow you to do things that you will regret later.