I can’t write at all

It is not always essential that writing has to be faultless. Reflective writing may also enhance learning. Think carefully: what kinds of writing have you tried earlier? When you write an informative text, for example, accuracy is more important. Look for models on the Net for writing a CV. Study academic theses and articles from your field to get ideas about academic writing. Make use of unilingual dictionaries and grammars when you’re writing. Look what courses are offered and choose a suitable one especially if you want feedback on your texts. But also write just for yourself sometimes: use the words you want to learn and don’t be afraid to experiment with language used by other writers.