Peter F. answered 06/24/22
Published Author; K-12 Grammar Teacher; 18 Years' Teaching Experience
Hi Tony,
Using “I have experienced” is grammatically correct because your character is referring to his 13 years of life to date—meaning he is still alive and does not necessarily know what will happen next, period.
I hope this helps!

Peter F.
06/24/22

Bob P.
Just have the character say "experienced." Auxiliary verbs slow down the reader.06/24/22
Tony O.
Thanks, Peter. I've been going back and forth with this for the past 2 days, and still people have been giving me apposing arguments because the story is written in past tense, which I think is what is making this confusing? :)06/24/22