How can I please get my life back again?

Im so sorry about your sister hon. I lost my older sister when I was 19. She was just 24, I miss her a lot. Anyway, I know this is hard, but clean your room first, a dirtty room will make you feel more depressed, I know it sound stupid but it's true.Church helps a lot too and it can benefit your parents. The United Pentecostal churches are good, visit one sometime. There's others who have gone through the same things who can help you hon and they will will care for you.