Could be bigender(two genders at the same time), but since itc changing, genderfluid. Nonbinary typically means that they aren't masculine or feminine, so it is likely not that.
#am i nonbinary or genderfluid
edgy lion
drifting folio
You could most likely be genderfluid, since technically non-binary means that you don't indefinitely as a gender at all (I say as I've been non-binary since the 8th grade)