I think you should really let your parents know that you would like to talk to them and if not, let them know that you need someone to vent to or talk to and that you would prefer a therapist/psychologist because this isnt something you would like to talk to your friends with and you would like someone who you wouldnt have to get too personal with like you would have to with a friend. You could get personal with the psychologist and tell them whatever you want but it doesnt mean that the psychologist would take it personal since she/he is experienced with this. She would just give you good advice and a lending ear.
Sorry for the run on sentences. And good luck!