I want to walk around the U.S. or maybe even the world. I'd obviously take transportation if I have to (boat/train/plane) but I want to go and see what the world is these days. I would do small jobs here and there for money, food, shelter, etc. Idk why I want to do this but I do. I am 18. Am I crazy?

But I love traveling too, I hope to work for the embassy once I graduate.
we only roughed it once but it was summer so it wasn't that bad
You will also need money for places to stay and food, because realistically you won't get a job just like that everywhere you go.
Just don't be naive and you can do it.