so this is my senior year in high school i am going to a new school and im just curious if i should just tell people im trans. Or just not say anything about it.

That is your decision, what are the pros and cons?  From your picture you appear to pass, how is your voice?  Are you separated enough from your previous school that someone might know you.  Do you mix well with the students in your class?  After thinking about these things only you can decide.