'Molly, who am I? Whay am I here? What is it that I am seeking in this strange place, day after day? I knew a moment ago...but I've forgotten.'

-The Last Unicorn, Peter S. Beagle

Words which are very familiar for some of us, less so for others, but non the less speaking to the essence of our human predicament. It's moments like these that the Goth lives for. This and lots of pain, darkness and chaos. If the Goth can find non of this to angst over, the Goth will angst over not having anything to angst over. So when a Goth is angsting, it's probably best to not worry so much, and just simply partake in the dark and deep thoughts they choose to express if they are of the expressive kind. If they are not of the expressive kind, they will probably go sit on a roof for hours on end or under the bed where it's dark. When this happens you should let them be for a few hours and then climb the roof/ squeeze under the bed with them and just share the silence and darkness.
Be absolutely certain of your feelings for a Goth though, because if you do this, there is a great danger of the Goth loving you, and when a Goth loves you it is perhaps the best and worst thing in the world.
The worst: because the Goth will discover the deep tragedy in loving others, and will mope about that too.
The best: because a Goth's love is one of the most genuine and selfless specimines of that human emotion that is talked/sung/written about too often yet rarely really lived.

This is because Goths are Goths. and Goths are Goths because they were either unloved growing up, or they unloved themselves growing up, shutting out all human affection, because they are convinced they don't deserve it or that it's not real.
In retorspect then, at the heart of the Goth is a lack or loss of love. And if somewhere along the course of their grey, moping lives, they encounter it and it penetrates their thick walls, they will cherish it like King Haggard when he saw the unicorns, and thought he was going to die because it made him happy for the first time in all his life of unhappiness.
In truth, we are all looking for unicorns, Goths do so more actively and angst over the lack of them more openly. But I can promise you, when every one of us tastes the hidden disillusionment in the reality of their extinction, we each die a great yet silent death. The ordinary human being will only notice a slight sadness, a discontent from time to time. But us Goths spend the rest our lives mourning that death.