To express what I think

Are you good at writing sentences in order to express what you think?
Do you like to write sentences in order to express what you think?

I had really disliked to write a composition
and had been very poor at it since I was a junior high school student.

However, I began to read books,
and reading books became interesting,
then I became to like writing sentences to express what I thought.
Now, I have a lot of topics to express,
but I can't always express them freely because of several reasons
I would be glad if I could express anything freely though....

Don't you have similar situations?
Could you guess why?
I wonder how you will guess the reasons.