The planet isn't random, it is one that can sustain life in our form. That we don't know everything about our existence, that we have to piece it together as best we can, and share our findings with the next generation, is all very exciting and amazing and awesome to me. I guess I am just the type of person who loves open world games :)
Also, it makes me get less upset when I see shitty things in the world - the fact that life that is just evolving to survive can get our shit together as well as humanity has, is frankly pretty amazing and impressive.
You lament that you run into so many people who care about those things, and they are blind to the fragile and fleeting nature of it all, but I am unsure why that is such a horrible thing. Everyone is going to choose their own meaning for their lives, and sure, some will choose things that I don't understand and I don't think are important. But that is their life, and them choosing to care about those things doesn't change your life. You are not bound by their preferences.
In fact, I think it is great that all different people have such varied opinions on what is important. I get to observe them all, and see what life would be like under various scenarios. The human existence is so amazing because we all get to lead our own separate little 'experiments' in how we should live our lives (what we should do, what we should care about), and then we can share with each other what we have learned while trying these things. Some of the experiments will be utter failures, and some will be successes. We can learn from them all.
If you want to leave, you're free to go.