I'm a programer and bought typewriter. Novel starts writing by itself

I've never been a writer as a novelist. I wrote many blog posts, but never something meaningful. Recently I've started to looking at typewriters and fell in love in Smith Corona, so I bought Silent from 1946. Immediately after I started writing, novel started writing itself. I found that weird feeling, that I'm not a writer but just a channel or medium for that story to go through me on a paper. Anybody had this feeling before?