Girls, Is it normal to have severe guilt and self loathing for things you did as a kid?

I was a very bratty mouthy angry child. Threw horrible tantrums for toys and stuff. I was very jealous of a cousin I had that was very spoiled and still is spoiled. My grandparents were rich but were pretty much evil. They stole my dad's inheritance money and disowned us. They did give us a dime for school clothes and supplies. You think when your grandparents are rich they'd spoil you a little. Im not talking buying you everything you ever wanted. Just maybe once in a while after not seeing you for years at a time they at least let you have something. I threw fits because of they way they treated me. And that they wouldn't buy me things. I grew up poor because of my grandmother that and my dad's mental health issues. I bullied a kid because I was being bullied. I apologized to him for what I did to him. I said and did weird things too due to not having any social skills. My parents were very withdrawn and my father almost never left the house. I feel so guilty and have so much shame for the things I did. Its starting to effect my entire body. I feel so sick to my stomach and paranoid and horribly depressed about what I did. How do I overcome this and move on?

Girls, Is it normal to have severe guilt and self loathing for things you did as a kid?
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