April, you are doing the correct thing in seeking therapy. This lifestyle of make believe is not healthy, nor is it fair to those you are fooling. I wish you luck in your recovery.
Lola, the "imposter" of the documentary "Catfish" received sympathy, and fame and is now selling her art as "herself'. She too has serious issues that need to be dealt with.
Creating "alters" is an escape, but it is like jumping from the frying pan into the fire...the ending has no chance of being pleasant.
Often, your "pretending" to serve your own purposes (disassociation, boredom, ego-enhancement, or whatever) ends up adversely damaging the person or persons you have played. They often beared their true souls to you, trusted you and in many of these twisted relationships, developed a true love for you. The betrayal, sense of idiocy, shame, feeling of violation can only be compared to an emotional rape.
I hope you eventually see the consequences of your actions and seek help in resolving the motivating factors that allow you to engage in such behaviour.