You're not young but you're not really old either at 37, and it's not like there's anything wrong with getting older. Getting older has its benefits in that you have enough experience to not waste your time with things that don't matter. So it's a positive.
> I am interview now but my identity has been shattered.
You are not your work or what you do or what you have or haven't accomplished. You are you, and it's your relationships with yourself, people, family, friends, etc. that matter.
> Everyone tells me it’s not too late to start again
You aren't starting again. You are simply transitioning and growing. Nothing to be ashamed of there. In many ways, many would like to have a clean slate, and you've got a good excuse. Haha.
I recommend seeing a therapist. Just like how a student going to a professor to ask questions about something they're stumped on suddenly realizes the answer to their own question by merely saying it out loud, one can have the same experience with life questions and problems and a therapist. And if you don't answer your own questions, the therapist is there to help you answer them, either by providing answers or finding them with you. Friends, family, and strangers can only help so much. A therapist is paid to help you, and they are trained in the art.
Pick up a hobby or do exercise. Even better if you join club or organization that provides those things.