I actually hate my younger step siblings

So, this is gonna be a longer one, because there's alot to the situation. I have two step siblings, they're aged 7 and 5. I'm 17 years old, I've known both of them since our mom was pregnant with them. I know I probably shouldn't, but I feel so much animosity towards them. Now, I know I'll get comments like, "Grow up, they didnt ask to be put into this world." and "Well, if you weren't a bad older sister, maybe they'd be different.", basically how I'm in the wrong for hating them because of the large age gap. I hear that argument everyday from my parents. As evil and hateful as I may sound, I love kids. the only people I've really felt this negatively towards is my family, especially them. My close friends and everyone else would be absolutely shocked to see who I become when I'm around them. I'm not trying to play the victim, their presence alone drains my soul.
This isn't some normal sibling rivalry either, it's daily, 24 hours a day. In the morning, when the kids try to get into my sister and I's room, I want them out. 80% of what I say to them is "get out" like I said, just their presence makes my blood boil. They terrorize the whole house, everyone gets irritated with the two at least once a day. Our grandmother doesn't even like them. They're very annoying, nobody, I mean NOBODY would last 30 minutes a lone with them without snapping. We've had at least 3 babysitters for them, they all quit. The 7 year old is a boy, and he's always making the 5 year old girl cry. She cries so much, over anything, everything. When she's not crying, she's being just as annoying as he is or just being gross. They're so fucking weird and gross, especially with each other and with the dog, if you catch my drift. I feel so bad for the dog, sometimes she'll just hide with/behind me. Not to mention they're spoiled rotten. They have so many things my sister and I would've never even thought of having. That's not why I hate them though, that's not a reason to. The only thing I guess I'm jealous about is how easily they get away with shit. Yeah, they'll get spanked, but they don't even care. They're always fucking cackling, not laughing, cackling.
To sum things up, I just hate being around them, with then in public, around my friends, I've never said "I love you" to either of them. It hurts me how strongly I dislike them, I know it's not right. But I can't help it, I've tried to be nice, but they're just so god awful. You'd have to see it to believe it.. I can't wait to get out of here 🙄🙄🙄🙄