Is it normal to want to pretend to be a vampire for one night?

Fantasies are normal, but it's not in anyone's best interests to try and take a fantasy about non-consent into real life.

look for an emo who's into cutting himself
then you can cut him and drink his blood, he'll be stoked there will be less mess to clean up anyway and if anyone asks he'll cover for you and say it was his own doing.

It may be hard to find an emo they seemed to be killed out in the mid noughties when they all grew beards wore their parents clothing and became hipsters. But the looking like a vampire part will be much easier. Just find some fangs from a novelty shop and then wear a black cape (can be a sheet.) die your hair black and use alot of product to comb it back and flat. add mascara to the underneath of your eyes and use some makeup or white powder to make your skin complexion pale. Grow out your nails so they look like claws. Move stealthily and use elaborated, melodramatic movement. Stay in shadows and away from mirrors.

Good luck.

Think I'd be down for that. Having sex with a vampire... Why not, we all have to do something weird in our lives right?
A girl looking like a vampire is hot!

I have a good sized vein you can suck on.

People do this on certain holidays. Also this thing called "Vampire Ball" you might want to check out.

I wonder what it wold be like to have sex with Bloodrayne...

yay?

"I really want to look like a realistic vampire. Then go to a club alone and find a random guy, get him really drunk, and take him home."

Okay, with you so far, this is all good...

"Then (as gently as possible) stab him in the wrist or neck or do something to make him bleed excessively and then suck his blood"

Wait, what. Dude, that's not cool. You shouldn't stab people. If you do stab people, you shouldn't suck their blood. Vampires don't suck blood, it's more of a "scrape-and-lick" procedure. Scrape, and lick.

Really though, you'd be looking at assault (possibly murder if you do something particularly stupid), and probably AIDS from drinking infected blood. Blood, by the way, will make you puke like a fire-belching dragon after it coagulates in your stomach.

Pretend to be a vampire 24/7. What makes you so special?

Sure, why not. I have a similar fantasy, however not due to it being like a vampire thing.