It’s not possible to not have anything to say. It might be worthless, it may suck, but at least you said something. Most people don’t. I used to keep it all in, but after you start sharing what you think it gets addictive. And you don’t necessarily have to write. You can paint, sing, dance or lick the back of a frog, if that is what you want to say (although it would still be pretty weird). What counts is that you had the guts to do it, and that is a good start, and these days starting something is not easy. We are better at full stops.