it is not like Й
ы - is a particular sound, that should be trained as much as others.
Russians destinguish difference between vowels: и (don't confuse with consonant sound й) and ы.
The articulation of Ы is almost the same like И, BUT the tongue should be relaxed, moved a bit backwards and not press the lower teeth.
Try to pronounce Мы, Вы.
Listen to some audio recordings that you like and pay attention on this sound.