When you are speaking with friends, it is not necessary to ask them to correct your English – just speak and have fun. You can work on building your confidence and expressing yourself. You should leave the corrections to a professional. As in your own language, many native speakers of English make mistakes or do not follow grammar standards, so many people are ill-equipped to help you work on your English. It may be tempting to listen to the advice of a well-intentioned friend, but it may lead you to make more mistakes and make your improvement more difficult. Work on grammar and structure with your teacher. Have fun with friends. Now get out there and speak!