the same dream ive had since i was 12

okay so basically ever since i was at least 12 or 13 ive had this really vivid really realistic dream it would be me and my friends chilling having a good time smiling having fun then at one point they slowly die in front of me one by one and every time its my turn to die i always wake and i never quite understood why i had this dream all these year same friends dying different scenario  at first i thought it was just my fear of losing people but now i dont really know and i cant really explain it