The word nothing nowadays means something.
It's just like asking someone "What's wrong?" and then they'll say "Nothing." When in fact there is something.
In this case..."Nothing" just means "I'm just being." Sometimes it could mean that you just don't think it's important enough to classify it as anything but "Nothing".
I am quickly reminded of The Neverending Story and THE NOTHING haha.
This post probably made no sense Lol