Hi Anshushakti,
Great advice so far, I think. Journaling takes practice, and you get better, and it is never done perfectly or completely. One help is to write anything that comes to mind, without judgement or making sense, and another tip is to sense into your body as you write. You're not trying to fix anything so much in journaling as you are feeling, exploring, inquiring. Think of journaling as open-ended, without a goal. This attitude of looseness will allow more flow and insight, over time.
Another experience you may have is feeling blocked to access certain feelings. That's OK too. You can write about what it feels like to be "blocked:" unsure, frustrated, blank mind, self-pressuring to get it right, etc. All you can do is follow your experience, and precision will come as needed.
Andy B.