To each individual, the world we live in is perceived differently. As humans, we have ultimate control to make our life our own within the limits that we are born into. For example, people who are born into a country that has significant control over its population, there are certain regulations that one must oblige to. Yet within those restrictions people should find away to express themselves and make their life unique and try to make an impact not only on oneself but also on others. It is impossible to shape and impact everyone in the world, but it is possible to shape the ones around you and to that individual those people are their world. You can make the world your own safe place and as big or small as you wants it be. You can create and manipiluate your "world" by focusing on your wants and needs and not others. It is important to sometimes be selfless, yet at the end of the day it comes down to whether or not you are satisfying your desires.
Our thoughts can also greatly impact the world around us. By defining and formulating the feedback we get from our actions, we readjust our future actions towards others, then repeat the process. With every positive feedback and confirmation from our pervious doings, our world becomes molded and clearer to us. We then can fully shape our true self.
The culture we were born into can also form and shape our perceptions on reality and the real world. Cultures tell us what is acceptable and what is not. From having culture impact each person's world that they live in, it creates a variety of depths between people's perceptions of how to live and impact others. For example each culture has its different rituals and practices. To others that do not participate in these activities might believe that they are wrong and offensive, yet that is just because they were not raised the same way.