For me it's important to differentiate shame and guilt. Guilt usually means I've done something wrong. Shame means I'm a bad person. I'm not a bad person, but I've made terrible mistakes. I don't think you're a bad person either, because otherwise you wouldn't care about what you did or who you hurt.

Besides making amends with your parents (if that's possible), you need to forgive yourself. Bashing yourself over the head with your mistakes isn't going to help. It'll just cause more depression and anxiety. What did you learn from this? Are there ways to avoid this in the future? What can you do now to help not make these things happen? This would be work you could do with a therapist.