I don't think I am sure of what I did
To clarify, have you taken responsibility for the thing you did wrong?
No it's still unclear whether I've really committed a bad deed.
You are not being responsible for your own behavior. You need to take responsibility for what you have done. If you cannot remember your behavior then you need to write it all down as you do it.
Doesn't make sense.
How about I put it this way, why not retrace your steps and place yourself back into those situations to figure out what you did? Keep things in mystery can be a little distressing so it would be best to try to figure it out to finally be sure.