Happy birthday to me!

Today is my birthday, and I came to/arrived at a new classroom, new teacher and new classmates students, I didn't tell my classmates . I'm quiet angry and puzzled. (why? how would they know, they are new to this class and to you!) She(???) They (or did you mean the teacher? very confusing!) must know today is my birthday, but she didn't say anything to me. Pretended today was not special.Why? She is my best friend! (who? they are all new!)
今天是我的生日，我到了新的班级，新的老师和新的同学，我并没有告诉我的新同学，我有点生气和疑惑，她肯定知道今天是我的生日，但是她没有对我说什么，就像今天没有什么特别，为什么？她可是我最好的朋友！

English is fine, but it doesn't make sense!