Hi there,

I am so sorry for the bad experiences you have had! I can understand why you find it hard to trust professionals. As a child I can imagine it felt hurtful to be told it was safe to talk to the psychologist and then find out he told your parents what you said? Unfortunately as a child, confidentiality doesn't apply in the same way as it does as an adult, so your parents are allowed to know what you talked about - although if the psychologost telling your parents about your father made your father hurt you in any way then he handled the situation wrongly.
The Therapist you seen sounded so unethical and really by his actions should be struck off the register. You have the right to report him and complain about how you were treated.

I have encountered many bad professionals in mental health and therapy over the years. Sadly there are bad ones out there, however please don't let these experiences stop you from reacting out for help. There are good, genuine, trustworthy therapists out there.
You don't need to open up to a therapist straight away. Infact you could choose a few therapists and go to the first session with each and explain how you feel about trust and what has happened in the past and tell them that you need to take things very slow in order to feel comfortable to talk about anything sensitive in detail and see what they say. You have a right to find a therapist who suits you.

When a T asks, "what brings you to therapy" you do not have to tell them the exact details if you don't feel able. You can explain what your past is and tell them you are there because you know you need support, thats all they need to know, you can talk about whatever you want until you feel comfortable to tackle harder issues, obviously when you feel the trust is there.

Please don't give up hun