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human
[General Fantasy] How do fledgling vampires get over the initial "eww" factor involved in ripping open a person's neck and subsisting entirely on their blood?

Obviously some (mainly those who I assume became vampires willingly.) fledglings can just jump right in to the cannibalism party, but I feel like a lot of them would have to get over the actual hunting, killing, and consumption of humans. And I know it's not *technically* cannibalism, but I feel like vamps and normies are similar enough to still trigger that empathic response of "maybe don't kill people?".  

Unless there's a chemical change in the brain that blocks those sort of feelings, or if the vampire is a different being entirely (like in Buffy, where they're corpse-possessing, mind-snatching demons), I can't imagine it's easy to get over that stuff.

Then even once you get used to the idea of killing and eating another person out of necessity, you still have to get used to blood itself.  Which is like, the second grossest part of the body that we still consider food.  I feel like I'd get over eating people way easier then I'd get over having to eat (drink) nothing but their blood.

So how do they get over these initial squick factors of their new life?  Or are they not supposed to?  Is the gross-ness of their diet part of their "curse", similar to how other undead might not experience taste anymore(like the crew of The Black Pearl)?

Side question: Assuming it's not part of the curse, since a lot of vampires often mention quite enjoying the taste of blood(it tends to taste different to them, I've heard it described anywhere from "warm butter" to "fine wine"), do they ever get used to the monotony of it?  Do different people's bloods taste different enough to keep them from getting bored, or would it be comparable to me deciding to live on nothing but peanut butter sandwiches and giving up after a week because now they taste like nothing?

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I tagged the post as "general" because I felt the topic applied pretty broadly, but if you have examples or relevant universe-specific info, I'd still like to hear it.
gpt
Becoming a Vampire changes you.  
To become a vampire, dying is part of the process, and that alone can be life-changing for most people, the then becoming a vampire after dying is even greater change.  
You stop being a human, and become a vampire, something different. Sure, you look human for the most parts (minus the teeth) but you are fundamentally different.

But what is the biggest thing that allows vampires just to feast on blood is the hunger.  
There is nothing quite like it.  
Imagine the hungriest you have ever been and that is nothing to a vampire's thirst and hunger for blood. Even if you would have a incredibly empathic person turn Vampire, that thirst will make them do things they were not ready for.

Another reason why Vampires often have no problem with it is because most vampires are sired with intention, accidental siring is rare. Vampires takes time to pick a person they believe would make a good vampire.

And yes, While all Blood taste like blood, it's more like how all wine taste like wine, but different types of wines tastes somewhat different.  
It's also based on the fact that vampires are no longer human, imagine a predatory fish, they feed only on other fishes, do they grow tiered of it? No, because they are made to eat fish, a vampire is made to drink blood.