Bio has come to be accepted in popular usage generally for any item of bio-graphic information, just the name to a detailed profile.
So, I suppose you can use Bio and expect it to be understood correctly and serve your purpose adequately. Probably not auto-biography, which suggests a full length life story.
However, it seems your use case essentially relates to life stories/ life histories rather than personal profile. In which case, you should actually consider something on the lines of Blog or MyStory or even LifeExperiences. [I suggest joining the words, with camel case].
[Edit-1] Per Comments:
The suggestion of camel casing was just to get one single "word" and still retain readability. The selected term may be needed not only for text-field label but also its variable name.