I am also a nice person whose life is "fornicated over" by DUI's. My next (which ain't gonna happen) would be a felony. I won't tell the stories of how I got them - I drank, I drove, I got caught. I went a long time feeling like a very bad person due to these major lapses in judgement. It still stings. But - every day sober means another day towards putting those things so far in the past that they won't haunt every waking moment. This approach works for whatever it is you feel bad about in the past. Keep stacking up the sober days. Live simply and honestly. Try hard to do no harm to yourself or others. Time does heal.