It can be hard to make friends. I am very outgoing but I don't make friends easily because I don't trust people. I know what you mean by putting on a mask and faking it because I do this everyday.
As you are seeing your therapist for help, try and find a way to be open and honest with her. I can't go to a therapist, but I know when I am going to the doctor for an appointment I will write down a list of my problems because I know when I get in there I will freeze up and not tell the doctor what I need to tell him. Would making a list of things ahead of time before your therapist appointment help?
Love and best wishes

