AITA For telling on my group member for doing a project on his own.

AITA I (female 17) am in a Spanish class for my high school and the class is mix with junior, sophomore and freshman. This class deals with alot of quizzes and we rarely get projects in this class. The whole class gets really excited to have projects and I was really happy because I can work with others really well. But we can't pick our group member only the teacher which sometimes I don't mind. The day I get assign my partner's 1 freshman and 1 sophomore. The sophomore partner was absent the day before the project was due. I don't blame her because the teacher didn't tell us when the project was due. We haven't started our project because the teacher only gave us 2 and a half days to finish. The freshman and me got started on our project. The the freshman ask me "hey can you do sophomore part of project". I didn't want to say no because he was younger than me and I didn't see it as a problem then. I started work on the sophomore project then he kept asking me to change the whole thing even my work. I started to get annoyed but kept my mouth shut. This went on till the end of the class. He ask me at the end of class "hey when will you be done with this". I sighed I replied "I guess tonight" I was already stressed out by my other classes. I finished a little that night then in my morning class. I walked in the Spanish class and the sophomore girl was there I handed her lines she was supposed to say. Then the freshman ask me when did you finish this. I look at him confused "I finished it last night". He said "oh I wrote all of lines instead". I was upset I wasted my time writing my own lines and the other girl lines. I could also get in trouble for this because he did all the work by himself. We also had to memorize the line without the paper. I had more lines then the rest of them. When it was our turn to present I forgot most lines I wanted to cry. I was overworked for nothing and I'm already stressed about my other classes. I thinking about telling my teacher but I feel guilty getting them in trouble. I don't know what to do. AITA