All that you really want in life is to change how you feel. Again, all your emotions are nothing but biochemical storms in your brain, and you are in control of them at any moment in time. You can feel ecstasy right now, or you can feel pain or depression or overwhelmed - it's all up to you. You don't need drugs or anything else to do it.
Awaken the Giant Within (ed. Simon and Schuster, 2007) - ISBN: 9780743274333