I was in an at-fault car accident 12 years ago. I got t-boned by another driver who was going very fast. I was shook but otherwise unharmed. The other driver got hurt pretty bad but lived. I went through the same mental and emotional hell, but my parents were just thankful that I was okay. I was too scared to drive for a few weeks. It sucks that your dad isn't being sympathetic with you, but you're not alone. Countless other people have similar wrecks with worse outcomes. You made a mistake, yes, but nobody got injured and you acknowledge it. That's the first step in recovering from a wreck. Just take it easy on yourself and breathe. You'll be okay.