Confused

Usually when i "get off by myself" i usually image myself as the other guy. But all of a sudden i stop getting off that way nothing seems to work other than pretending i am the bottom getting dominated. I didn't know where to post this so i decided here. Could this be because i jack off to much and can i go back from taking a break. I do not want to be in a relationship where i cant get off to my own man, Advise please and thank you.