I don't want to pay my Aunt the money I borrowed from her.
That sounds selfish. Do you think it is okay to do that your Aunt?
I am sorry for my actions. However, after I borrowed the money I realized that she would be after me for repayment and I decided to run away so she can't track me down and I could put her in the past and move forward in my life.
You should always pay back what you owe to people. Be responsible and people might feel sorry for you and just give you money.
I had every intention to pay her back at first, but then life happened and now I just don't have the money.
Life does happen but so does for your Aunt and she might need the money back. And she did lend it to you expecting it back.