Why do we exist ?

All this world, we live life, we work, go to school, have fun, enjoy ? What is this world? Is it computer simulation? Is there a god, and if yes, what is exactly god? We learned that god is someone who maybe created this world? But also we learn that we are not created just like that.You learn that god made Adam and Eva and from them, we are all created? Also we learn that it was evolution, Darvins theory of evolution, that we were monkeys like many thousands years ago and thanks to evolution we are who we are and we constantly evolve. But even we are here thanks to evolution, can someone tell you what is exactly space ? I don't think anyone can answer that question.
If this is computer simulation, and god we all know is not what we thought is , but instead is a alien that is incharge for this space and this simulation. What if this is just a computer game that makes itself and 'evolve' ? Something that is aslo possible is that population , people like us had their technology 'evolve' so far that they made simulation of life. This is for me most possible . Because I don't see higher point in life, like we live , we die.
About life ,
You constanly make choises, what if you only think that you make them but instead it's meant to be like that . Like , imagine that you are making a simulation, but everything what is going to happen , you know it , because you are making it . Why would they give you opportunity to make a choise and then make everything what is going to happen , deppending on the choise you make, like imagine it with a few doors and you have to chose which door to open, and they have to make something for all the doors, but if they make you think you are chosing and they chose for you, they would only have to make it for 1 door.
Do you have idea why we are here and what is life ?