Everyone has the right to confidentiality, even if you're under 16.
All professionals who you have contact with, and/or share information with, will try as hard as they can to maintain your confidentiality. That means they will not share your information with anyone else without your permission.
However, there will be some situations where the professional is worried that you or someone else has been harmed or is at risk of harm. In these circumstances they may take advice from someone who specialises in this type of work and they may have to share the information to be able to make a decision as to whether any action needs to be taken to keep you or another person safe.
The professional will do all that they can to ensure you know who the information is being shared with or who they are going to talk to.
If you are under 16 you can still get access to free and confidential sexual health services including chlamydia screening and condoms by visiting your GP or integrated contraception and sexual health (iCaSH) service.