You don't want to be House, lonely chemist. He was an angry, drug addicted sadist and only a character in a TV show. Now it would be fun to be Hugh Laurie, who is a great actor and seems to be a nice guy. All the knowledge you have, you earned. Nobody else put that in your head. And I bet you know a lot more than you think you do. It's OK if you don't save the world. No one person could. I used to want to, also, and it made me frustrated and depressed. It took me decades to break out of my "Mother Theresa Complex" and realize that I could help my own world instead. In my case, it was the people around me. But it could be the local environment, the local animals, or whatever.
I don't mean to be preachy, I hope I don't come off like that. But I remember going through similar stuff when I was younger and it still comes up for me sometimes. So I am thinking about you and sending you good vibes (very 60's stuff).