Poetry has the virtue of being able to say twice as much as prose in half the time, and the drawback, if you do not give it your full attention, of seeming to say half as much in twice the time.
I began the way nearly everybody I ever heard of - I began writing poetry. And I find that to be quite usual with writers, their trying their hand at poetry.
I used to write sonnets and various things, and moved from there into writing prose, which, incidentally, is a lot more interesting than poetry, including the rhythms of prose.
For me concrete poetry was a particular way of using language which came out of a particular feeling, and I don't have control over whether this feeling is in me or not.