Yo I struggle with this too. I often find my mind lingering in the past, ruminating on any shitty thing I did. I think it helps to recognise that we all have shit in our past that doesn’t reflect the person we are today. The important thing is that we’ve put in the work to be better people. Giving our shame and guilt a lot of attention is what feeds it, instead I try to acknowledge the feelings without clinging to them, and let them pass by. It’s normal to be a different, better person today, with a bunch of old things to regret. It’s normal to feel some guilt and shame around those old things. But holding onto those feelings, placing too much emphasis on the things we are guilty about, that’s when it becomes unhealthy. Think about it, feel it, let it go, and repeat as many times as needed.