How to Delete my account?
You can visit this help page, which will guide you through deleting your account.
Is it possible for people who speak poor English to ask a question on this site?
Most people here are willing to help you converse in English, as long as you give them some starting point. For them to understand your post, your English should be at least comprehensible, which in turn can help make sure your question keeps it's context.
Excerpt from a post on official policy for non-English questions:
Now, if askers try to use English and put in “sorry, my English isn’t
very good”, that’s fine. Heck, a lot of native English speakers aren’t
very good at it, either! The reason we have collaborative editing is
to learn and improve together. This is totally fine and even
Comment on disputed question
Don't be discouraged by this incident. To quit this wonderful Q&A site should be an extreme last step. I have gone through your question and your English was pretty good. I did see, however, that somewhere in the middle of those counter comments you used words like "psycho". Please avoid abusive words and don't indulge in fights with anyone. If you find any comments offensive then you can flag them or politely ask the commenter to delete them.