My best suggestion to you, is to write your thoughts down. That could be here if you wanted feedback or just on a piece of paper. When all sorts of stuff is running round in our heads, it's hard to clarify and think logically about things. But I find if you try to write things down, it can help you to think clearly.
The other thing I have done, is to write about my trauma. I find it really hard to talk about. I have written it down, and handed it to my T to read. It opened conversations. Eventually I was able to read what I'd written aloud, and gradually, I'm getting to the point where I can speak about it without reading from a sheet of paper, or clamming up completely. She has already read everything, that happened to me, so talking about it is easier. She already knows, so I'm not telling her anything that will shock her. It takes time. And sometimes, it doesn't matter how you tell your therapist, (written or spoken) - just tell them. There really is nothing pleasant about therapy - it's hard work. You just have to ride it out. Feeling safe in therapy, and building up a relationship with your therapist is important. I say several, before I found one that I 'clicked with'. Like I said it's never going to feel 100% safe to talk about your trauma, but you will know, when you are with the right therapist, and you feel as safe as you ever will to talk about it. Remember, that however hard it is to talk, it WILL benefit you in the long run. Trust your therapist, and try your best to open up, in whatever way you can.