Ah, don't underestimate the difference 1 person can make even at the smallest level . . . whereas One Big Contribution is great, Many Little Contributions is what moves society forward. And, the One Big Contribution cannot occur independently of the little ones.

There is nothing wrong with wanting to do great things. While you are striving towards that, you owe it to yourself to also find interests that just bring about a basic sense of pleasure. These things are not mutually exclusive. And a human brain needs the balance. I believe your "semi-depression" is mislabeled "ennui" . . . resulting from a lack of engagement in life's various pleasures outside of academics.

Ponder this . . . how many who have reached greatness have done so without friendships and relationships?

So sorry about your parents' separation.