I started therapy and I wasn't even sharing personal information except just telling her I've been feeling down for a few years and cried immediately. Every session I had (6) I always ended up crying. I don't want to because I get red and it's just annoying. She told me to not hold back or bottle up my emotions in the room and to let them out.
It depends on how comfortable you feel with your therapist. I am impulsive sometimes and say too much to people. With the therapist, I am relaxed and I just say whatever is on my mind or what bothers me. I haven't told her stuff I've done that I am ashamed of. I don't think we are on that level yet. But so far I have been just telling her things that bother me without spilling everything I think of.
Make sure they are a good therapist and once you think you can trust him/her, try to open up little by little. The more you tell him/her, the more they will understand you which leads to more specific tips to help you.
I cry all the time and I don't like it but it ends up happening. She tells me it's my body's way of indicating something is not right. She said just like a cut you get. It needs to bleed to heal.
We need to cry to let out whatever we hold within us. I hope to have a session where I am well enough to not cry once. Lol! My last session (7th time meeting with her) I didn't bawl so that's an improvement! I held it back though... But at least I was powerful enough to not let it flow.
Good luck to you and I hope you can heal ))