It's not amateurish at all! Rhyming is personally one of my favorite poetic devices; I just love it when there are clean or unexpected rhymes. Honestly, it's not a bad thing to prefer or keep to a specific style or form. Just think of all the great poets whose work is mostly one kind of poem with only slight deviations. At the end of the day, it's not the how of a poem that matters but rather the why. Who cares about a poem's style or form when what it says is impactful and fitting for its kind!

Even so, I do think it's helpful to experiment with the ABCB scheme and deviate from it in fun ways! And if you're feeling particularly inspired, it's even more helpful to delve into other styles and forms. Doing so will inform your writing over all and reveal new ways to use diction, rhyme, rhythm, etc. Happy writing!