Well, i would myself correct them anyways, however if this is not an option, just correct them yourself in your head. I am almost 17, and deal with this all the time. Cut your hair, look up passing tips, excerside and be on a healthy diet!
(I don't know if you were born in a female body but if not then pretty much all of this is useless..)I would wear large hoodies to cover up your chest and use sports bras to keep you breasts close to your body instead of hanging out. I would also 100% stay away from bandaging. While tempting when you don't have access to a binder it is best to not as it may mess up your spine in the future. You can also look into different donations for binders if you are in desperate need of one. It can take close to a year but it is better then bandages. I would also make yourself look as boyish as possible (cut hair, deeper voice, ect.)
-this works whether you were born in a female body or not-
Also, Idk if your parents do this but don't let them introduce you! You can confidently walk up to the person your introducing yourself to and say "Hello, My name is Adrian." You can also add in your pronouns. Bye doing this you not only keep your parents from using your deadname but you also look like a gentleman/ gentleperson.