It proved to be a pivotal experience.

Meaning

A crucial or highly significant experience.

Examples

• John: How did your internship go?
• Alice: It <b>proved to be a pivotal experience</b>. It completely changed my career path.
• John: In what way?
• Alice: It showed me what I truly wanted to do. It really <b>proved to be a pivotal experience</b> for my future.