me and my fear of coming out

You could ask them questions about how they feel about the LGBT+ community, like "How would you react if your friend was nonbinary?". Or you could start talking about an openly LGBT+ celebrity in a conversation, and see how they react. If their reactions are negative, it's probably better to stay closeted, but if they seem to be okay with the LGBT+ community, you can come out safely.

Your parents will find out sooner or later, they are your parents. Best to come out sooner than later. Besides, if they can't accept their OWN CHILD's body, then they are not real loving parents.