How do I poetry?

Sorry, the silly title is obligatory.

I’m in a relationship with someone who loves poetry—that is, loves writing it and loves reading it. And while I’ve never written any, I’ve been told that there is poetry to things that I write.

But every time I sit down to write anything, I can’t get started. I just have no idea. What’s the structure behind it? Does there need to be any? Does there need to be any sort of rhythm?

Poetry’s just one of those things that I can never “get” but I’m fascinated by it.

So… how do I write poetry?