I have been experiencing this for 4-5 years now.I told my psychologist about that,and I realized that I did it because i wanted to be noticed in front of my relatives(they are the main heroes of my fantasies).Just wanted to prove myself,because I have been keepimg this anger towards them for my entire life,even though they didn't really hurt me or anything.I felt neglected as a kid,felt not good or smart or pretty enough.And these fantasies are the results of that childhood trauma.I guess ,you are engaged in the same situation.