Surgery is today and I’m so scared I kinda wanna cancel..

I’m (25F) so scared for surgery. (Hw: 358 Sw: 335 Cw: 320)I have to be at the hospital at 8:30(cst) and I woke up at 6. I kept thinking of what-ifs for the future and rabbit holed a bit during the night. If I laid there and stared at my ceiling and ask myself if I'm truly okay with this and if I know I want to do it, my response is a very solid yes. I want to take hold of my health and my life. But i'm so afraid. People can have complications later in life like severe vitamin deficiency, hernias, GERD, twisted intestines, barrett’s disease, etc. While I know those are only possibilities and I have a higher chance of getting sick due to being very overweight, I can't help but be scared. What if I suddenly develop a bad complication right after surgery or even 10+ years down the line? I've been considering canceling due to scaring myself. So many people have amazing success stories. I've been really good during pre op and have lost 14 pounds in the 10 day pre op diet. I know I can do this. But i'm equally terrified that I will regret it and possibly die or develop something terrible.. I'm so scared..