People may use I/my simply for a personal taste, such as a blog post of a mother about her daughter, instead of a formal article. Some use it to emphasize that

People may use I/my simply for a personal taste, such as a blog post of a mother about her daughter, instead of a formal article. Some use it to emphasize that they are expressing a personal opinion. Sometimes it shows they are more self-centered, which is not necessarily a bad thing. Or it could just be habit. Anyway, I wouldn't psychoanalyze it too much.