What have you got to worry about?

I watched the Indian movie "Me and Anita". At one point Meena is talking to her Grandmother who (referring to reincarnation) asks "How can you be scared [about life] when you've lived so many lives and have so many to go still?"

Robin and I felt like we'd known each other before. We talked about the possibility of having met in past lives. What have I got to worry about if I'll see her again?