The other option you have is to raise that you wrote a letter to your T as a way to work out your feelings, and you can talk about the letter rather than giving it to them to read. T's are trained to interact, and reading a letter is not interacting, and however clear you think your writing is, it is probably more information than they can absorb effectively. I doubt that giving someone a letter to read is an adequate substitute for having a conversation about the thing (in terms of T, especially).