In a context of universalization of Higher Education (HE) and fragmentation of educational trajectories, consolidating a process of educational and social mobility implies, for many students with non-traditional backgrounds, important identity conflicts. Based on 40 qualitative interviews with non-traditional working-class students enrolled in an HE institution in Barcelona (Spain), three major patterns of what we have called 'habitus transformations' have been identified: adaptation, substitution and dislocation or rupture. The results of this study suggest that the universalization of access to HE does not mechanically imply greater opportunities for educational success for non-traditional students. The contribution also introduces the subjective experience of being a non-traditional HE student and the emotional impacts and contradictions involved in the processes of social mobility through HE.