Achieving fluency may be difficult, but it is a worthy goal.
I think I understand you quite well most of the time. For example, I understand that you are complaining that I don't understand you.
When you are not trying to write a composition but are just stating your opinion about something you do a pretty good job of expressing yourself.
Perhaps it will make you feel better to realize that some of the problems you have with writing compositions are some of the same problems native speakers have.