RATS is the best. I had four small incisions and almost can't find one of them anymore. As to the surgery, at least you're a woman. My wife and I had a consultation with my surgeon before the surgery. At one point, he turned to my wife and told her to be prepared because I would be depressed after the surgery for three reasons,
1. He's young. He said most people requiring this surgery were 20 years older.
2. He's a man. And we men don't emotionally handle such things as you women (talking to my wife), and
3. He's an engineer, and they tend to overthink things.
At that point, I replied, "Wheen, have I eeeever overthought anything?" Then we all had a good laugh, which my wife and I kinda needed about then.

You may have guessed I'm a pretty positive person, but I still had a bit of anxiety before. Sounds like you're doing fine and you're right. It'll be good to get rid of that thing. Plus, they'll be able to get a good look at it and definitively tell you what type of cancer you have which will determine future treatments. I have the EGFR mutation, so I take a small pill once a day. That's it!