Perhaps because it's something that weighs very heavily on your heart. If it's something that bothers you terribly then you're going to have to ask yourself what the best way to deal with the situation is. But guilt is a natural feeling that many people experience, try not to let it rule you, you deserve happiness.
If guilt is an ongoing negative emotion you have, it's not surprising that you would want to expel it. You don't have to let negative emotions run your life, just make sure you expel it in the right way so you don't hurt yourself or others.
It can be or maybe it seems adventurous to you...but you should understand if something happened due to you you would have already been punished so its probably not you fault...dont blame yourself for no reason ...just do say sorry if it is your fault..trying to repair the situation would serve best ..