Should I travel with only a backpack for the next 3 years?

I think there is a lot more to it than that, have you thought about innoculations, travel insurance, money, safe places, what to do in emergency, contacts, how you are going to support yourself, a laptop ain't going to save your life when you are lost in the middle of nowhere with no food, nno water and a broken leg, sorry, but reality check, yes go travel the world, but make some plans and always let your family know where you are.