If thats how you feel aussienic, you need to either ring your local Kingdom Hall of Jehovah's Witnesses, or wait until someone comes to your door again, and tell them you would like to be on their 'Do Not Call' list. From then on, you will get an annual visit to check that you still would like to be left alone

The reason we go door to door is because Jesus commanded us to. Matthew 28:19,20 - "Go therefore, and make disciples of all the nations, baptising them in the name of the Father and of the Son and of the holy spirit, teaching them to observe all the things I have commanded you. And, look! I am with you all the days until the conclusion of the system of things." We feel we have a message that will mean the difference between life and death, and we have been instructed to tell as many people as possible. Going from door-to-door used to be the most effective way to meet people, but for a while now I have found that most people aren't home. We also do other forms of preaching, like public transport, business, and shopping centre witnessing.
There are of course other scriptures that go in to more detail, such as Luke 10:1-12, where Jesus first teaches his apostles how to preach. I don't want to go into too much detail here unless asked to, I would prefer to answer question privately, so as not to inadvertantly upset anyone.