Well, damn... I'm so sorry to hear that! I have a thing for both goths and gingers, so I wouldn't want to exchange one for the other!That was the first song to make me cry, I mean ugly cry but not for the right reasons...
Weird I know, i'll explain.
I was 14, I was dating a goth girl. She'd convinced me to dress more like her so i'd "fit in" with her friends who were all "waaah, the world is bad and humanity sucks" types and I was all "YAY, life is awesome and I love everyone" like a mini ginger hippy.
So, we play dress up, she alters a few other things about my looks including my hair and then Evenescence comes on and I look in the mirror.
I'm wearing all black with black makeup but the worst part, the absolute tipping point, i'd let her dye my hair. My ginge was now jet black and I fucking hated it. I've always loved my hair and I just looked at my reflection and broke. She'd turned me into my exact opposite and I bawled like a bitch.
We broke up.
I won't blame goths or those with alternate lifestyles at all, i've dated others since and none tried to change me it was just her.
So My Immortal made me ugly cry because an ex had turned me from me Pippy Longstocking to Wednedsay Addams.
No worries about crying, though, for LorgarAurelian guessed correctly - it's a reference to the legendarily awful Harry Potter fanfic.