How do I travel the world?

I absolutely love travelling and experiencing other things other than what I already know. I'm 17 and have been to five states so far. Oregon (which is where I live), California, Nevada, Arizona, and Utah. I know I'm too young to start travelling the world right now, but someday I would love to go to Japan, Europe, Australia, and the eastern and southern US for the cultural experiences. I would also love to go to Antarctica, Greenland, Brazil, Canada, Africa, and Nepal for the Hiking and camping experiences. I want to experience the world for myself and not through Google Earth. How do I make this possible, or will this never happen?