I'm not going to take my twin's feelings into account
Does this have to do with your twin's personality?
Their personality is too much that I feel like I don't get to just be myself.
It's understandable to want to focus on yourself at times, but you shouldn't do so at the expense of your sibling's feelings. You should try talking to them and working out a way for both of you to share your feelings and get what you want.
I can't talk to them about it. My twin is dead and I'm the only one remaining.
I am sorry for your loss. Having a dead twin will make it difficult to solve any issues you had with them, so you should try to solve them with therapy. They will work with you so that you can feel more like  your true self.