I would like to help you with your question.
I am sorry that your aunt died and that you are having such a difficult time. You are grieving and that is a normal and natural process. What often happens when someone we love dies, is that we begin to question our own mortality. As we wonder where our loved one is, what is happening to them, and ponder all that death means...we naturally come to think about our own death and what that will be. Because so many aspects of death are a mystery to us, there is no where for us to turn for real answers.
Your aunt's death reminded you that death is inevitable and that someday you will also die. This is not a comforting thought and, like you, some grieving people do begin to wonder what life is about if in the end we are going to die and others will have to deal with the sadness and pain of grieving.
I am going to suggest a good book for you to help you cope with you grief and will also refer you to a good article:
Remembering With Love.Messages of Hope for the First Year of Grieving and Beyond.
There is also a journal that can be bought to go along with this book. It is called:
The Remembering With Love Journal.
Here is a helpful piece about grief:
I await your response.