I have probably over 100 moles all over my body of all colors, shapes, sizes, and textures. I also grew up in Florida, where my family would go out on a boat every weekend and bake me in the sun from a very young age. So needless to say, I was incredibly anxious before my first dermatology visit (which was this December, and I'm 23).
First off, the dermatologist I had seemed like she knew exactly what she was looking for. She had no doubts, even about the mole on my right buttock which has ragged edges, different colors, and is now 1cm x 2cm (about 2 pencil erasers). When I asked about it she said "It looks like a mole you've had since you were a kid and nothing to worry about" and she was right on! I did get 2 moles on my back biopsied, both negative. But she assured me (before I knew the results) that even if they were malignant that it was nothing to worry about because I was young and these did not seem to be in any late stage. Skin cancer is incredibly treatable especially when caught early (lucky for the both of us, we're young
). The good thing is, you are getting things checked now. Also, like I said above, I have hundreds of moles that are all very different, and of those hundreds my derm found two potential melanomas, and neither were malignant or even ones I was initially concerned about.
As far as the biopsies were concerned, my derm did a scrape biopsy, and aside from the initial numbing, it was painless and nothing to worry about. I saw my derm right before Christmas too, so my wait was probably a bit longer than most. However, my dermatologist was so comforting about the potential results I had very little anxiety about them. The best thing to do is keep yourself occupied with things you enjoy doing and people you enjoy being around and remember that you're young.
Sending the best of vibes your way!