I don't think this is an interesting confession.
Why don't you think it is an interesting confession?
I have no reason to think so. It's just not interesting.
Even if you don't personally think that your confession is interesting, other people might find it to be. You don't have to apologize before speaking and instead you can just tell your confession. It might be useful to work on your self-confidence if you continually doubt the quality of the stories you tell.
I am sorry I thought I needed to apologize, it won't happen again. I will keep on telling my stories.
They don't have to be interesting as long as you want to share them. Interest is not the point of a confession. It is meant as a healthy, honest way to get something off your chest.