Well if you are genderfluid its supposed to be shifting a bit...
sometimes some aspects are stronger, sometimes weaker...
but it will not leave you ever.
Simply knowing should be some kind of relief.
If you concentrate on one aspect that should help...
and you could use a few things that remind you of being girly...
a keychain with a symbol for example...
something nice that reminds you of your own being girly...
maybe even a photo of your painted nails...
if you try to relax instead of being afraid, that should help, too, feeling more of yourself.
if you read through what you have written about being genderfluid that is something cis people cannot write...
"Wowza i enjoy being non-binary"... you can read it through again, as often as you like...
so its proof and will stay with you...
hugs