the past is my nemisis

I have made multiple mistakes in my past that lead me to believe im a bad person. thinking about them often sends me into a panic attack. i cant help but feel i need to be punished. i hate this feeling, what should i do?

Everyday I wake up, all my mind makes me think of is the stuff I’ve done in the past, like all day I’m in a constant cycle of judging who I used to be and it hurts so so much. I wish I never thought to do those things, I wish I had been more mature than how I was before, it’s really lowering my self worth and I don’t think I’ve ever felt this miserable before, like last summer was the worst because I was dealing with this shit, I about almost ended my life over it, and I thought it would get better, which it did, but it didn’t last but for a while. As soon as it became 2025 I was going through it again, having constant cycles of “I’m a good person” to “I’m the worst person imaginable” and I’m so sick of it because I just want to feel like the good person l like to imagine myself to be, but I can’t because of shit I did in the past that I obsess over. I’ve cried and screamed so much over it and it seems like it will never leave me.

When I talk about how terrible I used to be to my girlfriend it makes me feel like I’m gonna do it again which I don’t wanna do and it scares me and then I get intrusive thoughts and feelings about it doing it but I don’t want to, weird I know.