DO NOT be fooled by those language schools whose only objective is luring you to follow their accounts and eventually buy their courses.
Just simply think about it: in what kind of interview you'd be asked to "introduce yourself in English", and what information would the interviewer expect to learn from your reaction? - Obviously, this is just a BASIC test of English speaking. The point is how well do you speak, but never is what do you say. Remember, this "question"(request, actually) is usually used ONLY for entry-level positions which don't need a lot of English in work. They won't expect you to be really good at English, so don't be too nervous about contents or grammar mistakes. Just speak. You probably don't know that you'd beat a certain number of candidates on this test even if you dare to say just several words.
So if you're asked to introduce yourself in English in an interview, the best reaction in my opinion is to speak in English as good as you can - just say something about yourself, like your family, education, hobbies... whatever you prepared, be relaxed and be confident.
Finally, as I said in older posts, you don't need a 100% perfect "walkthough" or "Q&A template" to hide your real skill-level and help you getting the job. No need of disguises. In most cases this kind of masquerade can be easily detected, or maybe you would occationally pass but trust me: finding a job that FITS you is far better than finding a job that you're not competent in.Good luck!