I'm trans, identify as female (technically also genderqueer/third-gender in some contexts, but it's more an internal thing of anthropological significance than something I display), have been on hormone therapy for a number of years, and it's only in the last year that my T levels dropped from "high even for a cis male" to "really low even for a cis female." In other words I spent literally my entire pospubescent life up until recently with very high testosterone. So I doubt it's that.