Poetry is poetry whether it depicts a sad and soul wrenching theme, or if it sends someone to universe that they feel happy in. However, i still feel the same way i do about rhyming, but if that what helps you get it out, then you have every right as a writter and artist to use rhymes.
Looking back at everything i have written, i was a troubled girl who was saved by pen and paper, friends and even the art of others. I greatly advise anyone to start writting, drawing, singing, playing sports, anything to keep you happy and steer you away from suicide. You do matter whether you know that upfront or not.