You changed the type of narration in the first sentence you said you were Lizzy and in the second sentence you were story telling third person.
The better way to word the second sentence is: 'Lizzy was a senior in high school and had been thinking about going to Harvard university but then plans changed however not for the better.'
You can try to find more complicated words to make the text more interesting.
look mom and dad before you say no I just want you to hear me out. I know you think I'm to young but listen to the positive things I will be able to contact you if I'm in danger or if I need to stay after school you will be the first person I call or if someone breakes in i call call the police this is why I need a phone
