My friend,I had the same problem before i start practising LDing.I dont have any real lds yet.I am a highly religious person myself.I was afraid that something evil will happen to me during dreams.Like demons etc.But i said to myself that a dream is a dream.You can manipulate your own dreams by having lucid dreams.To me he solution was my faith in God(please dont judge me).Nothing can touch me as long as my faith is strong.This may sound stupid to a nonbeliever.But thats me.So i believe that you HAVE TO keep up the practises.Lucid dreaming is youd key to unlock the door of a world free of negative thoughts abkut your past.Proceed without negative thoughts.A dream is a dream.