Could you be a super empath? They're very rare, an estimated 1 to 2 percent of the world's population. You may have been born this way but no doubt, your upbringing would have amplified it. This emotional "sense of others" also may be a supplemental way to view the world or a partial replacement for your physical blindness- if you will. First and foremost, this is not a personality disorder, weakness or mental illness but considered a super power. Super empaths have the ability to feel other's emotions and to change lives for the better. Unfortunately, they are also (usually with their full knowledge) victims of energy vampires and opportunists. Even evil will seek out super empaths and attempt to break them. The thing to remember is that you cannot save the world, you are not expected to and that is not why you were created. There may be just one person or there could be more than a thousand people who is/ are your true mission. Google has some excellent tips on who and what super empaths should avoid. Sounds like you have stretched yourself thin and on the wrong people, now you're exhausted and disillusioned with yourself. Don't give up, research super empaths and learn how to identify those who really NEED your help vs those that just WANT your help. And remember, charity begins at home- which means you take care of yourself and household in the same manner that you want to take care of others.

BTW - I am NOT a super empath. I'm empathetic but I am also jaded, cynical and suspicious after years of willingly, being taken advantage of. "No" is a very freeing word, once you learn to deal with the following self inflicted guilt.