Hello truegem,

As you are probably aware already, being a supervisor means you can't be best buddies with the people you are supervising otherwise they will run over you. You've been a supervisor for 10 years, that means you are good at your job, someone would have let you know by now if you weren't any good at it. I hope you are getting the support you deserve from your boss. It does sound like you are down on yourself right now, maybe a little holiday from work is needed to get things back in perspective and maybe a chat with your doctor about some medication to help.