Being a poet =/= being a novelist.
THAT, yeah, I'd buy an argument that you'd need accomplishment first to call yourself that since...well...hard to fairly call yourself a novelist if you haven't actually written a novel, but instead of course have a GENIUS idea and maybe 3 pages of notes...from two years ago...but never mind that, when you get cracking, oh boy, watch out, F. Scott Fitzgerald and Toni Morrison!
But just "poet?"
You could write haikus at work (naughty, naughty) post them online...
And given that many of the West's best works of poetry had starts that were just as dubious, if not more so...yeah, sure, you can call yourself a poet.
Good luck getting people to count you as a GOOD poet, or getting anyone outside your friends to read it, just because the market for poetry's extremely difficult and you can probably count the number of modern, living poets most people know on one hand...
But, hey, as long as it doesn't interfere with work or life, why not? Write those poems if you like, take your shot and live that dream...or, do like the aforementioned Ms. Dickinson and just write them for yourself, largely, and who knows--maybe you'll leave behind hundreds of poems that get revered after your death.
...Just don't use weird dashes and the same goddamn meter for each and every fucking poem, OK? ;)