I'm also a very private person who isn't trusting and bottles things up. I've had many therapists in the past but have had a parent who always was required to be there or learned everything I said when I was honest in a private session I was also a minor then so it was different. I think if you find a good one it can really be helpful, make sure you really explain things otherwise they can get confused which is what happened to me some of the time. After bottling things up for so long I didn't know how to explain my feelings thoughts memories etc. A friend or someone who has been through similar experiences or had the same diagnoses can be really helpful too. Even a stranger sometimes.