The person who most makes me want to die also most makes me want to live.
What person is that?
It's my sister. She's always bringing me down, but is also there for me.
This sounds complicated. Your sister shouldn't be bringing you down. You should discuss your problems with her and maybe with a counselor.
Yes, you are right.
Good to know that you agree. Talking to her first would most likely resolve your issue since she seems reasonable.