Hi @enby03030
Your parents love you, wholeheartedly, and are not going to stop.
My teenage child recently declared themselves nonbinary (you can read my thread here) and my response to my child has only been love, acceptance and concern for their wellbeing.
The fact that I don't believe in the unscientific and unprovable magic of gender substance doesn't mean that I can't love and respect my child who does seem to believe in such things, and it's much much more important for my child to feel loved and secure than it is for us to share the same beliefs.
Disagreement is not hatred. Some people believe in physical reality and there's no more proof of the existence of gender-identities than there is of the existence of angels or unicorns but believers and non-believers can still love each other.
Your parents may be believers, some are. You are only going to find out if you talk to them. If they are gender-critical then please understand that it's entirely possible that their experience of the idea of gender is actually very very similar to the experience of someone identifying as nonbinary. In both points of view you'll find people who don't feel they have either a male or a female gender identity. The difference seems to be broadly that someone who identifies as NB works on the assumption that most people do have a recognisably male or female gender identity which exists independently of their sex, and that NB are a small exception to that rule, whereas GC people work on the assumption that most people get on with their lives recognising and accepting their physical sex without registering any kind of identifiable sensation of having a gender identity, and that therefore 99% of people are nonbinary unless they declare themselves otherwise (but will generally use pronouns based on sex, rather than gender, which is what has always been conventional in our language). It's impossible to say which of these is correct as no one can ever experience what it means to have another person's sense of self so there's no way to define what it feels like to have any particular gender identity so can never be verifiable how prevalent any particular feeling is, or whether people who use the same words are feeling the same thing.
Which is just a long-winded way of saying even if your parents do disagree with your understanding of gender, that doesn't mean they don't understand any of what you are going through.
I have no idea to what extent I speak for other parents in general or yours in particular, but I believe it will be generally true - we love you, we get that it's tough going through puberty in a world as sexist as this, and if you feel you need to ask people to use they/them pronouns of you as part of coming to terms with the world then we will do our best.