I've Died Many Times but No One Will Remember

On my eighteenth birthday, I died. When I woke up, the cake hadn't been cut yet. When I died the second time, I was at the sink and the faucet was dripping. When I died for the third time, I was on the rooftop and believed someone I shouldn't have believed. I survived the fourth time. But I've lived many times. Each time he was killed by different people in different corners of the same world. Later I found out The moment they killed me, they were no longer "human". I don't know who is pushing them. I only know one thing: I can't die. You can't kill yourself either. I've died many times. How many times has this been here?