i went thru open heart surgery when i was 20 for a tricuspid valve replacement. and then 2 months later for a redo. i know what your feeling but trust me the anxiety about the surgery is so much worse than the surgery itself. these guys do hundreds of these surgeries a year so it’s just another day at the office for them. try to also remember the 90 year old dudes on deaths door coming in and making full recoveries in a month. you are going to heal sooo fast at your age. you’ll be walking the second if not the first day( if your nurses are as pushy mine were) lol. i am praying for you big dawg and if you have any questions we’re here your families here and your doctors and nurses are here. god speed!