Had a teacher do it with us in class when I was in 8th grade, then did it again in high school - INFP both times. In my later teenage years I was fighting with my dad a lot, and looking up communication improvement resources, and stumbled across typology again. Figured out I was an ENFP instead of an INFP, and that dad was an INTP, and that perspective has helped me understand him a lot better. So, recently, has been the realization that he is an enneagram 6w5 and I am a 6w7. Things can get quite fiery between us, as I'm sure you can imagine.
Now I am working on improving communication with my ESFJ, maybe-1w9 boyfriend! We're both stubborn.