Submitting for English Check need not be a negative
It is common to have errors and mistakes when you write in English. This is the reason why you should edit your writing and let it go through an English check.
Your thought processes are most often led by the language you speak at home all the time. When you write in another language even if it is your second language, it makes sense to take help for editing and proof reading. As you practically translate mentally from your first language when you write in English, you need to go for freelance copy editing besides an English check to communicate what you want to say and say it well - more so, when you have to submit an assignment.
Don’t feel ashamed about having to submit your writing for freelance copy editing or for proof reading which with an English check could make the change your writing into a well crafted paper. The native English speakers themselves could at times have difficulties with the language. Even among the English children aged around 15, the National Foundation for Educational Research (Brooks et al, 1993) found relatively severe spelling problems “to the extent that their ability to communicate in writing is seriously handicapped.”