It would be a good idea. It will avoid confusion. People will understand you more easily.
It is not necessary to sound exactly like a native English speaker. Most non-native learners of English, even advanced learners and who have become very proficient and fluent, often retain a slight accent of their mother-tongue. This is not a problem. In fact it adds personality and flavour to the way you speak, and native speakers of English will find your 'foreign' accent quite appealing!