Trans people challenge society, and theoretical and political debates are too often confined within a chiasmus that articulates an apology of identity and liberation and a warning about the loss of immemorial references. But how can we get out of this opposition if not by trying to understand the lived experience of the people we are talking about? This text seeks to integrate empirical data, clinical experiences, phenomenology and contemporary gender theories to understand the experience of the self of trans and non-binary people. In their existence, trans people highlight what is already present: the subversion of the binary gender system, but also the connections between body modifications and the construction of the Subject. Trans subjectivities are not a mere replica of an idea about the feminine and the masculine, they express something beyond and speak of multiplicity, of becoming, of relationships and of the importance of felt body. The bodies are considered as signifying materialities and as the origin and place of trans becoming. Arising from phenomenology, new materialism proposes a conceptual tool to apprehend these affected, meaningful and transformative materialities.