As a young girl my journal or diary was the place I could write down my deepest feelings. Now as an adult I still use it for that purpose. A journal is neutral. It is inanimate.A journal is not going to jump out of your hands and berate you for writing down what you think.
Use your journal to vent, rant and rage at the injustices in your life or the world. Write down your fears and concerns. Write down the things that puzzle you. When a dear friend died I could write about how the loss was affecting me. It gave me the opportunity to vent the deep sorrow I felt.
Remember to also use your journal to brainstorm some solutions to problems, dream big dreams and express gratitude for the things you do have.