i couldn't. not only is being alive a drag 98% of the time, but being normal seems very draining, dull & boring (from an outside perspective 100%).
i'd hate to be content with mediocrity and i'd hate to be entertained by the convenient "simple" things in life (socializing on smart phones, using apps, going out to chat over coffee, working and going home to a family, only watching tv and movies and having basic interests). even if i was born rich, most rich people don't use their money in interesting ways and just want fancy houses and cars and choose the most boring options to flaunt their money. so i would opt out. i also just can't stand the way people live on this earth, i would only want to be re-born in a world that humans never existed in. or if i could be reborn as a herbivorous animal in the world where humans don't exist? that would be the ideal.