The question "why are we born?" is a philosophical one and has been asked by many thinkers across time and cultures. There's no definitive answer, but there are many perspectives.
From a biological perspective, we are born to propagate our species. Life on Earth evolves through the process of natural selection, and being born, growing, reproducing, and dying are key parts of this process.
From a philosophical perspective, there are different views. Some believe we are born to learn, grow, and contribute to the world. Some religions teach that we are born to fulfill a divine purpose or to learn lessons that our souls need.
The question "who made this world?" is also broad and depends on one's beliefs.
Scientifically, the current leading theory is the Big Bang theory, which states that the universe (and thus our world) began from a singularity approximately 13.8 billion years ago. This theory, backed by much evidence, doesn't involve a "who," but rather describes a natural, physical process.
Religiously and mythologically, many cultures have stories about gods or supernatural beings creating the world. For instance, in Christianity, it's believed that God created the world. In Greek mythology, it was the titans and gods who fashioned the world.
In the end, both questions touch on deeply personal and complex themes that often come down to individual belief systems.