What is the most realistic way to travel the whole world?

I'm 20, just getting out of the military and now i want to travel...What is the most realistic way to travel the whole world?$What is the most realistic way to travel the whole world?Basically, you need a BIG budget for your travel. You also need to PLAN it ahead, the cities you want to see and the countries you want to visit. Also, plan on how many days or weeks you will stay for each place and what you ride to get there. I believe you can try packages so that it will be cheaper and more worthwhile. :)