Why couldn't things have been easier?

Life is complicated. Being a human makes it worse. By giving this body a brain worth 1.3kgs, things totally spin out of control. Constantly thinking, analyzing. What to do? What will happen next? What if I do this? What if I don't do that? And to think of it, they say we use just a miniscule portion of our brain's potential power!
When I am driving on the road, I think which gear to use, where to break, is the speed too much, do I have my license? Things that are in the bigger scheme of things, totally worthless.
When I am around in a public place I feel like singing. My sister tells me not to. Why? Is it prohibited? I want to fart but I can't so I go to a relatively isolated place and open the nozzle. Now no one can smell what the Rock is cooking! I want to drink when I go out to dinner with the family but I don't because I know it is not good manners. When I study I constantly think about what will happen if I don't clear the exams and that takes up a lot of my study time.
When I am thinking about the person I love, things go absolutely haywire. I think what she might be doing. I think what should I write in my next message. I think why isn't she replying. Has she started loving someone else? Does she even like me now?
Think, think think. To what end? I really don't know. Sometimes I wish I was like my dog. He doesn't have to think while peeing on the car's wheels. He doesn't bother what a person feels if he licks them. He doesn't care if he farts in the middle of the room( yes dogs do fart!). He doesn't mind being without a bath for days together. He doesn't mind eating anything below Pedigree. He doesn't even remember who was the last bitch he nailed! Life is so much more easier for him. I envy him.
But then I guess the world has been defined by us humans. I have to live by the rules. Think all the time. In other words be human. I really like that CBZ Extreme advertisement, "Thinking is such a waste of time!"