Welcome and congratulations on 3 months sober!
There is a lot of guilt and shame associated with addiction, especially as we look back at the mistakes that we made in the midst of using. Have you considered journalling? I was encouraged to do that when I was stuck and I found it really helped.
Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us.