Sometimes talking can be very difficult. Depending on the subject, of course. Using myself as an example, (as I am the worlds leading expert on myself) I was unable to speak about issues concerning gender. If I got sneaky with myself and tried to blurt something out suddenly, I would suddenly find I couldn't remember what I was trying to talk about. The thing was I really needed to get these things out. It took years before I managed to speak about it. No exaggeration.
I have caused myself problems now and then, by tying to rush therapy. I want things fixed. Now, if not sooner. My T advised me not to try not to try to make it happen. When I was ready. It would come. It did. Eventually. It's still hard to do.

Short version- sometimes we can't do things for our own good. Like speak about certain subjects, or remember certain events. I am not saying not to try. The fact you feel it's important means it is important. But stick to things you feel comfortable with. If writting works for you, write. Or draw pictures. Or use sock puppets. Whatever works as long as you are comfortable with it.