Writing English is hard for me.

I have been learning English seriously for one and a half years. Before that time, I (had) hated English so much. I never thought that I could/would be able to talk with a foreigner one day, but I have. Everything was perfect. However, writing is my worst skill at this moment. I wanted to apply for some international volunteer programs, but i couldn't because i could not write any essays which were required (for me) to fill in a CV. I didn't know how to use the correct grammar, what ideas I should write, or what words were reasonable, and I also had those problems when i talked. What should i do now? I feel worried about it.