My Aunt Shell had destroyed what credit I had at the age of 25yrs old. This sentence starts out with the possessive pronoun "My" and includes the pronoun "I" later. The last part of the sentence is strange, though. Who was 25? You? Your aunt? And we say/write "...at the age of 25." To add "yrs old" is unnecessary and incorrect.I see no adjectives or adverbs in there except if you want to count the possessive "My" as an adjective modifying "Aunt Shell."
I had to file charges on my only Aunt for destroying my credit for her owe personal gain. This sentence starts out with the personal pronoun "I" and includes two instances of "my" and one instance of "her" later. I think you mean "own" instead of "owe."
Lists of pronouns:
http://www.english-grammar-revolution.com/list-of-pronouns.html
http://www.english-grammar-revolution.com/parts-of-speech.html
Scroll down to see definitions of adjectives and adverbs, as well as lists of them.