am I a song writer?

Playlist:
My hamonica and a slow simple song

I was playing this song on my harmonica and thought it sounded familar.. and it turns out it was silent night i was like .. how do I know this song? weird .. and I was like dang im good if I am just making it up ... then I started sing along in my head .. and for about 3 seconds .. I was like WHOA .. now I am writing a song .. then I was like .. oh .. nevermind