system
Given the following post, respond as if you're commenting on Reddit:
human
[general superheroes] why do you keep your identity a secret to Everyone?

It makes sense to keep your identity a secret from the general populace because if villains find out they would target your family and friends. but where is the sense of not telling your trusted family and best friend? what do you not trust them to keep their mouth shut? 

Plus if a villain finds out don't you want your loved ones to be prepared in case of a attack?

That's not even mentioning having other (non superpower) people know can help as a support group and even create alibis for you.
gpt
The Netflix daredevil touched on this pretty well. Firstly under most jurisdictions superheroing is still a crime (i.e. vigilantism). The people you trust with your identity might not approve of your night job. Secondly it's a bunch of stress watching someone you care about throw themselves into danger on a regular basis. Watching daredevil get his ass beat on the news sucks, knowing it's your buddy Matt makes it so much worse.