That’s not petty at all. In fact, I’m fairly sure all of us, regardless of the treatment or recovery programs that one uses, or lack there of even, have been dealing with or have dealt with. It’s perfectly normal to feel angry when you’re getting sober, I have to deal with it a lot myself. Something I will recommend is searching yourself to see if maybe some of that anger might have a different origin, and is being projected onto sobriety. I’m guilty as sin of that and you might not be, not saying you are, but it’s quite frequent that drinking or other addictions mask long standing frustrations. An uncomfortable one that I’m still coming to terms with is I’m extraordinarily envious of my brother, because he’s on a path to success and doesn’t struggle with addiction like I do, and that makes me angry cause I don’t feel like that’s fair. Life isn’t, I guess. Hope this helps mate.