I had a couple classmates that pretended to be vampires back in elementary and middle school. They’d pretend their Koolaid was blood, complain about the sunlight, and bite their friends a lot. Not enough to draw blood, though. I haven’t kept up with most of them, but one guy is a teacher now. He seems pretty normal.
I myself was enamored with vampire stuff and in high school met an online boyfriend who really committed to the shtick of being a vampire - though a significantly weakened in bloodline so he could walk in sunlight. I think at one point he was also claiming to be a vessel for the archangel Michael. Please know this was all happening in 2000/2001, so long before Supernatural!
I caught up with him briefly about 15 years after high school, and he’s still claiming to be a vampire. A divorced vampire who smokes a lot of weed, but still a vampire.
i hope you check in with him in another 15 years to see what kind of vampire activities he’s up to