You should buy a house, life is not always about the money, you are going to have family soon and old parents to look after if they are still alive. Hence a fixed roof is important.

A vehicle is optional because public transport is often lacking in some places, this depends from person to person.

Travelling the world is also optional but at least know your own country because travel is a part of life's education ans skills. You learn a lot of things during the process of traveling.