Nothing is wrong with that. If thats the way you choose to live your life, great, more power to you. I however believe that as long as you demonstrate responsibility and control in life, you can still have fun and experience the world safely.
However, happiness is in the eye of the beholder. If you lived in a box your entire life an never knew of the outside world, you would say that you were happy, simply because you would never know anything else. I would argue that a box life doesnt give you true happiness or a fulfilled life. Just my take on it though.
Also, I was asking a question, so please dont jump to the conclusion I am attacking your beliefs. If you want to respectfully argue your side, thats fine, and I would love to hear it in fact.