I don't want to take care of my grandma anymore
Have you tried to bring this up with your family?
They never listen. I've tried everything to talk to them about this, but they always pushed me out.
Maybe try to talk to them again. I think that you should so that they know how you are feeling. You don't have to do it all by yourself.
They don't care what I have to say. If they did they would have figured it out a long time ago.
It is understandable that taking care of someone can be a big burden on you and not wanting to deal with it. It might be possible to put her in a home that way you can still visit.