Hey F22, I'm Penguin, and I'm a certified wimp- look, it's even stamped on my backside. I thought that surgery would be awful too, but when I had my deviated septum fixed, it didn't hurt at all thanks to the anaesthesia. There's nothing to fear (except death, but we can assume that you don't fear death since you wish to join the Air Force). Furthermore, find something you like and pursue it, no matter what the cost. Nothing is worth a life full of 'what ifs'.
Not to hijack, but if you really want to get into the history books, join NASA (it's where I plan on going). You get decent pay (60,000-100,000 annual salary) with good benefits, and there's an intangible sense of working toward something greater than profit margins.
-Penguin
You MUST be young. Don't worry, if you're at all adventurous or athletic, you'll get lots of chances to experience some real pain. Anesthesia will only go so far - the rest you get to feel. Enjoy it - it's really not that bad and experience enough of it and you'll lose that wimp stamp.
Second, you're entirely right about what ifs. Most of my memories from my teens, 20's, and 30's are real grins - so long as I'm thinking about times I hung it out there. Thinking about something that I didn't do is usually a frowner. A wise man once said that hell is full of all the girls you could've flicked but didn't. The statement can be applied more generally.
As for NASA, I started my career there (after grad school) in Wind Tunnel Test at Ames. I don't recommend civil service if you're ambitious or talented but it's very secure if you're not. At the same time, it's a decent resume tick and if it doesn't suit you you can move on. As far as something "greater than" I think you're mildly delusional to think that a bureaucrat's political priorities (most of what Nasa does is bent toward politics, imj) are somehow better or more honest than the attempt to create real products that real people find useful enough to be willing to pay real money - but that's just me. Like I say, experiment for yourself.
Above all DON'T WASTE A PILE OF TIME PLAYING COMPUTER GAMES.
Thus spake the old-ish man.