Worried about maybe having cancer?

I went to the doctor Ear nose throat specialist yesterday he looked in my nose and told me i have a polyp he used a lighted devise. He then told me he want to operate it to get it out right away. I have surgery scheduled in two weeks. I ask if this is serious he said can be but you have a 75% chance you will be fine. We need to look at this polyp under the microscope after surgery. After i got home i am thinking about this and freaking out, 75% is not that good right. I tried to call up to get some-more info. I feel great besides my blocked nose. I am 31 in shape, healthy? Went for a CT scan today.