Identity Experimentation or Exploration
However, the term that closely matches your description is:
Identity Formation (specifically, Exploration)
James Marcia's Identity Status Theory:
Identity Diffusion
Identity Foreclosure
Identity Moratorium
Identity Achievement
Identity Moratorium:
Refers to a period of exploration and experimentation, where adolescents delay committing to a particular identity, exploring various roles and possibilities.
This process is essential in adolescence, allowing individuals to:
Explore interests and values
Test boundaries and relationships
Develop a sense of self and identity
Erik Erikson's Psychosocial Theory:
Also discusses identity formation, highlighting the importance of exploration and experimentation during adolescence.