Hi @Olivia try not to stress. Just think about all of the reasons you came this far in the first place and the reasons why you want the surgery, and how long you have been wanting it for!
What helps me is looking up other girls stories on here, how some of them were close to cancelling the day before etc but are so happy that they went through with it in the end.
My cousin had a BA (though not through MYA) about 4 years ago and still says it is the best thing she has ever done. xx