Does a professional poet need an agent?
I don't think any writer has to have an agent. Agents are very good at looking over contracts and they're quite good at putting your stuff around, but you can do that yourself. It's said that some publishers won't look at a writer's work unless they have an agent, but you can make a name for yourself in other ways; through performance, or through appearing in small magazines. This is work that an agent can do, and there's no reason you can't do that for you. So, no, I don't think you need to have an agent.