I think people who use the phrase "it's just a phase" honestly think that their interests and beliefs will never change. I feel bad for people like that, but I guess it takes all kinds of people to keep the world turning.
As for my family, well, we're catholic, so we're all sort of death obsessed in a way. ;)
My friends just roll their eyes, or think my morbid interests are just cute and quirky...my boyfriend says I'm "goth on the inside".
I guess to me it doesn't matter what anyone thinks because I've always been stubbornly insistent on doing what I want to. I remember a time when I did things to improve people's perception of me, but now I'm like, eh. Think what you want.
"Life should not be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways, Champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming WOO HOO - What a Ride!"