Stop smoking drugs and eating crap, garbage in garbage out, that's what I've learned. Get out and do some exercise, it may be the last thing you feel like doing but trust me after a couple days it really makes a difference.
Then, get a lot of money.
Then, get some hot young chicks and score with them.
Once you have done this, come back to us and tell us this planet sucks balls. If this happens, you should then consult a doctor.
There are so many bad things about this world, that is without doubt. My life could be said to be miserable at the moment. I have worked 16 hour days for the past year, nothing else. I have made some money but nowhere near as much as my work has deserved, in my opinion. Nevertheless I would prefer the earth to be here than not. Why? Because the inanimate universe would be boring without music, cartoons, great books, great films, hot chicks, birds chirping (corny I know), green hills, green trees, beautiful scenery, the list goes on. Sometimes when I start to hate the world, I turn off the news, and listen to beautiful songs, this includes hardcore rap and love songs too, whatever I consider is beautiful. I then thank the universe that all this exists. Just try it.