Being highly empathetic - altruistic (which is acknowledged by those around me and even officially tested in a personality study) has rarely benefited me, and I don't consider myself that way; only other people have benefited from it. I never got any validation, credits for something I did or achieved, nor status. I really detest hypocrisy, people who act morally superior and lecture everyone, but ultimately fail to do so themselves. Make sure that your words and actions line up, or in other words "practicing what you preach". Funny because I was just talking about this topic with someone else tonight.
Anyway… what did it bring me? My entire life was filled with extreme abuse and neglect in various forms, isolation and feelings of alienation. In the end, it broke me. So I've personally come to see excessive empathy as more of a curse than a blessing. If you don't learn to protect yourself properly against this, you almost have no chance in this world.
Oh, and a side note: most people who constantly feel the need to brag about how empathetic they are, usually end up proving the opposite. In my experience, that kind of behavior is actually pretty narcissistic.
So coming back to your final conclusion; Yes, they exist, more than most people realize, but they usually stay in the background, quietly doing good without seeking attention. Because their kindness isn't loud or public, it can feel like the world is darker than it really is. There is still so much quiet kindness in the world, small, genuine moments of goodness between people every single day. It just rarely makes noise, so we don't hear about it.