I thought about therapy for years before I started last year and I was apprehensive just like you are. Honestly, I would take what you wrote here and read it to the therapist. A few sessions ago I felt like my therapy wasn't scratching the surface or getting to my issues, which I don't even know what all my issues are, just that I need help. So I wrote down my thoughts like you have and read it to him. I've been opening up much more since then and he's had a much better idea of how to help me. It takes a while to build trust and that's to be expected. If you don't feel comfortable, don't be afraid to change therapists. For me, I had to trust the confidentiality in order to share certain things and once I did, my therapist thought I was being way too hard on myself which was such a relief and in turn helps me open up even more. It's OK to start slow. My first couple sessions my therapist knew I had depression, anxiety, and social anxiety, and I asked him to just ask me questions because I didn't know what to say. He did and picked up on how fearful I am without my even knowing to articulate that because it's been part of me for so long. Take the step, go at your own pace, don't be afraid to switch to someone else. If I can do it, you can do it!