I do sometimes slip into nihilistic thoughts, especially when I'm down, but I don't think extreme nihilism (i.e. where you think along the lines of, "what's the point in doing anything or bettering myself - we're going to die anyway") is not healthy.
Usually, though, I would not consider myself nihilistic - personally I think there is a meaning to the life we live, but we won't find that out until we die.
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I'm sailing across Spectrum Sea, in my little boat.
The waters of the port were choppy. After I set off, there was a long, massive storm.
Years later, however, the sea calmed. I'm still on tranquil sea, but I'll never reach the Neurotypical Beach.