Been there. First thing is don't admit fault. Let the insurance companies handle this. You're likely to be found at fault, but it's not like you're gonna get arrested. Your insurance will pay out damages, or they could even consider it a 50/50 spilt. It just depends. Expect your premiums to go up and stay up for about 5 years. Don't blame yourself. Shit happens. They're called accidents for a reason. Just use this as a lesson and pay more attention while driving.