Here’s a corrected version of your text about Kristen Stewart:
Kristen Stewart has been a famous actress for about fifteen years now. She has been acting since she was eight years old, when her agent saw her performing at school. Her first role was in a film where she didn’t speak, but since then she has been in many films. She is probably best known for playing Bella Swan in The Twilight Saga, a role which she played for five years.
Kristen has lived in Los Angeles since she was born. Because she was acting at a young age, she couldn’t go to a traditional school, so she studied online. Since then, she has completed high school. She is now one of the best-paid actresses in Hollywood.
Something many people don’t know about Kristen is that she has equinophobia, or a fear of horses. She has had this problem for most of her life, but her fans only learned about it in 2012 when she was filming with horses. Kristen explained that she has been scared of them since she was nine years old, when she had a terrible fall during a horse-riding accident.
This revised version corrects various grammatical errors and clarifies some statements. If you need more information or any other specific aspect of Kristen Stewart's life, feel free to ask!