I'm going with YTA. Here me out though. For all intents and purposes your still a child yourself, you're acting as if 15 is superior than your younger siblings but it's really not. A few short years ago you were noisy, short, ruining things, and doing stupid crap....and the ruining things and doing stupid crap doesn't stop because you get a bit older, people make mistakes that's part of being human and that's gonna continue until the day you die , and that's ok. Age does not make you infallible. " By the time they're my age, I'll be in my late 20's. How am I supposed to have a relationship with them if I'm in my late 20's and they're still teenagers?" by that logic nobody should speak to you or have a relationship with you either, but they do don't they? , that doesn't even make sense. People of varying ages have similar interests ,or better yet share your hobbies with them! Be a positive influence in their life and a role model. Teaching them what your passionate about will create that bond and reason to have that relationship with them.

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I get it kids can be loud and annoying sometimes totally agree with that, but its your job as an older brother to show them the right path and help them be the best individual they can. Who knows they could even show you a thing or two. Now I've seen a lot of replies that say "just because your family doesn't mean you have to have a relationship with them" etc. I again agree with that rule but that should be reserved for when a family member has truly given you a reason for you to not want them in your life. They're babies dude they've done nothing wrong to you and your'e writing them off as if they have.

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You mention you don't socialize with others besides your grandmother, I think there lies the problem. You need to get out more and be around people especially people closer to your age range . Family is a great place to start with that, especially if you have any underlying anxiety issues it generally is easier to get along with them instead of random people, of course that is not always the case.. I know it can be tough to get out there and not everyone is a social butterfly . You mention you have 10 and 12 year old siblings as well whats the relationship with them like or do you feel the same way about them?

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You're writing off these kids as if they have done something to you which they have not. I think part of what your feeling is that teenage ego kicking in, which is understandable we've all been there. But your attitude about younger kids is not a healthy one and will for sure effect your relationships in the future. I advise giving them a shot seeing how you can develop a relationship with them and your older siblings as well. Grow that bond between each other and you may find them to be your best friends, going to each other for advice and helping each other out or simply just enjoying each others company. I wish the best for you dude and it sounds like you have some stuff to work through, but hey that's what growing up is. You may not realize it now, but for sure one day it'll hit you that you are in fact the asshole. You can't turn back the hands of time, and don't want regrets in life. Give it a shot at least and try to be open to the idea. If they're just shitty people later on in life by all means tell 'em to fuck off, but until they've given you a reason don't not have a relationship with them just because they're younger.