Hi, for context i'm a 19 year old female. 

I have a mole on my breast i've been worrying about the past 2 years as it matches all ABCDE characteristics, however i've had it looked at my a GP who specialises in dermatology who says it didn't look too worrying and sent me away - but i couldn't help but worry she didn't take me seriously because of my age, and she even mentioned she wouldn't want to biopsy it because it's on my breast, which won't heal very nicely 

concerned, i downloaded an app to check the mole and it said it was likely ok, and while i was at it i checked the mole next to it, and this was detected by the app as high risk. This other mole i've had as long as i can remember, at least since age 8, and although it looks dodgy (it resembles a black spitz nevus, it's small, almost perfectly round but very black with a slight red border. 

Because i've had this mole as long as i can remember, i always assumed it was fine, but now i'm so worried it's been cancer all along and i've left it god knows how long. surely if it was cancerous i would know by now because it would have spread, right??? but then again i know melanoma can grow very slowly, so i'm completely panicking right now 

I remember my mum being concerned about it when i was about 8, i'm not sure if she took me to a doctor or not though as i can't remember. My boyfriend has also expressed his concern about it in the past, but i brushed it off because i had it so long.

I have a doctors appointment next month to check both miles mentioned but i need help easing my nerves in the mean time, is this likely to be bad?