I’m not a good person

I did something a long time ago that I didn't realize was so bad at the time until a long time later, one night I was about to go to sleep and I remembered doing that thing. It was something I did willingly but it didn't cross my mind at the time at all that what i was doing was so wrong and I didn't know it was that bad if that makes sense. I feel so terrible the guilt is eating me up. I don't know what to do. I would never ever make that same choice or mistake again but its really upsetting me... I'm a Christian and I try to pray about it I even talked to my parents about it they told me to let it go but why is it so hard to?

How can I forgive myself for the mistakes I made as a teenager (maybe 15 through 18 or 19 I don’t remember exactly) when at the time I had no bad intentions I just didn’t understand what I was getting into? How can I forgive myself for being so dumb? I should of known. But unfortunately now dealing with real event and other themes trying to find “proof” it’s so exhausting and unsettling especially when the worst case scenario about my self and my past comes up literally every day and I have to fight it with “maybe, maybe not”…when will it ever go away. Do I even deserve for it to go away? No matter who I’ve told whether it was a parent or a therapist they all say the same thing…….let it go……..how am I supposed to do that. I want to do great things in life. I want to make up for all I have done wrong. I want to help people but I can’t even help myself. I hate myself. I don’t even like myself at all. I would go back in a heartbeat. But I can’t. I’m stuck in this mental hell. Will I ever be ok again…….

I did something 5-6 years ago when I was barely an adult, and I know it was stupid, but I know I can never take it back, and I hate myself everyday for it. I feel like I can’t move forward in life because I can’t forgive myself and honestly sometimes don’t even want people to see I exist. I haven’t done that same thing in years but I still see myself as a horrible person. How do I move forward. I’ve been in therapy since I was 19 and also have extreme extreme checking ocd and it hasn’t helped but this rumination has been a big problem lately.