Very sorry to hear you got into an accident. It doesnt matter how strong your frame or wheels are, if a car hits you or you bite it, you're still subject to serious injury. My suggestion is to get back on the bike as soon as possible and just ride, short ones at first, to get your confidence back. No doubt, it is your thoughts that are creating fear in you. Don't think, just get on it, but do think about what is around you. Good luck.