I feel a lot like you. I have been in therapy for 9 months now, most of that has been 2x per week sessions. It takes time. Especially if you're not used to talking to anyone about these types of things. I've gotten quite comfortable with my T, but even now, 9 months later (and at twice a week, that's a LOT of sessions!) there are still things I have not disclosed to my T. You've only had one session. I'd say you made HUGE progress in that first session and will do just fine. As you get more comfortable with your T, and more comfortable talking about things, it will all come easier. Everything you said is quite normal at this beginning stage.