That's because you are.
Listen, I just went through a cancer screening biopsy, less than a month ago, had to go in for surgery, a whole thing. I had the added benefit of having to wait three weeks for the procedure, and another two weeks for the results. That's a lot of time to consult with Dr. Google.
Was I tempted? Not a lot, but a couple of times I was, under the guise of, "I'll just check to put my mind at ease." - that was a lie, of course, because every one of those sites covers all possibilities, from "no worries," to "you've got mere days to live!" I was probably more concerned about the surgery than the results, TBH.
Seriously, get off the medical sites. I think it's human nature to go right for the worst, and that's right where your mind will go. Enjoy the day, the weather, whatever. Looking at that stuff isn't going to change the results of the biopsy or the doc's recommendations. Just wait it out, wait until the results come in, and don't worry about it until then.
I don't know if it helps to phrase it this way or not, but while you're in the waiting phase, you either have melanoma or you don't - you just don't know, that's all, and you're not going to know until the results come back, so just go about your day as usual until then.