Lack of success with only one therapist does not equate to 'treatment resistant'. I suggest you get back into therapy and with the goal of addressing your social anxiety and feelings of being behind developmentally. Explain to the new therapist what happened (or didn't happen) with your previous therapist. There are therapists who work on a sliding scale but cost shouldn't be your own guide in choosing one. You are not in competition with others regarding growing up; and yes, there are books that help one with social functioning.