Why a blog?

I've wanted to start a blog for a little while now but never found the right time. My life seems pretty uneventful right now, and also its probably the most eventful times of my life. So finally I decided to do it. Now I'm not very sure what I want from this blog. I want privacy but also I don't want to be the only one who can access this blog. But then why do I want privacy? Is it because I am afraid that someone will think they know everything about me. Is that selfish? But why not share a little part of me with the world? There will only be one me in this world, ever. My thoughts are so unique that no one can duplicate them and so the least I can do is quench their thirst with my posts. And so now as you are mapping my mind, my thoughts will linger in your head which is the whole purpose of this; to have my thoughts linger in this world after I'm gone.