Why does journaling not work for me?

I have noticed that when ever I try and force myself to journal, not only do I not actually benefit from it and end up writing nonsense, I also lose motivation for journaling and end up not doing it for a long time until I feel motivated again.

I have also undoubtedly tried to write whole pages at a time, which I now understand is a problem and should be avoided.

So for me, when ever I try and force it, it stops working.