Sure, here is a 15-sentence story about myself using the verb "to be":
- My name is Alex, and I am a student.
- I am 20 years old, and I am currently living in New York City.
- My family is from a small town in the countryside, but we moved here when I was ten.
- I am studying computer science at a local university, and I am very passionate about technology.
- My favorite hobby is playing the guitar, and I am in a band with some of my friends.
- We are not professional musicians, but we are really enjoying making music together.
- One of our dreams is to perform at a big music festival one day.
- Apart from music, I am also interested in sports; my favorite sport is basketball.
- I am a member of the university basketball team, and we are currently preparing for the next season.
- My teammates are very supportive, and we are like a big family.
- In my free time, I like to read books; my favorite genre is science fiction.
- I am also a big fan of movies, especially those directed by Christopher Nolan.
- My friends and I often go to the cinema together, and we are always excited about new releases.
- I am grateful for having such wonderful friends and family who support me in everything I do.
- Life is full of opportunities, and I am looking forward to exploring them all.