I don't understand your response. It's very common for empathetic people to feel great suffering. It's not "common sense" knowledge to learn how to maintain deep compassion while preventing the pain from affecting your own being. In fact, most highly empathetic people, like OP, feel burdened by this emotional state because the untrained person experiences compassion as double suffering (the suffering of the object of compassion and the suffering to oneself that comes from untrained empathy). The result is that highly empathetic people try to numb out or attempt to restrict their capacity for empathy.

The early Buddhist texts (the canonical suttas) describe meditations and trainings to develop this skill. The reason the suttas devote so much time to explaining these techniques is because they are NOT common knowledge.

The etymology of compassion means "suffering with". It's baked into the word (in English) the assumption that compassion involves suffering for both parties.

In Buddhism, we learn that compassion doesn't have to create suffering for the holder of compassion. We learn that it's possible to dwell in the state of compassion as a way of moving out of suffering, rather than moving into it.