I understand you are asking how to say "I don't need to tell you my bra size" in English.
Here are a few options:
* "I don't need to tell you my bra size." (This is the most straightforward and direct translation.)
* "You don't need to know my bra size." (This emphasizes that you are not comfortable sharing this information.)
* "That's personal information I'd rather not share." (This is more general and can be used for any personal information you don't want to disclose.)
The best option will depend on the context and who you are talking to.
Remember, you are always in control of what personal information you share.