My sister has tested INFP, but her Sensing and Extroversion are stronger than mine. I'm borderline INFJ-INFP with strong Introversion and iNtuition, but weaker on the last two. My mother is probably an INFP as well. My SO is pretty sure I'm an INFP at this point and his sister has tested as one.
I never made close childhood friends. It wasn't until I had college roommates that i was able to establish friendships. I tended to admire people from a distance and always had an intense and unfulfilled crush that would last for years even at age nine. During my loneliest time as a teenager at a boarding school, I would make up imaginary scenarios all the time on social outings. I would also wander off into nature any chance I found and would invent a paradise for myself. A rusted bridge over a muddy river wasn't a dilapidated scene, but the softness of the brown water and the sparkles of the sunlight on it were part of the magic for me. The bridge had years of stories to tell about people who had crossed over it with every imaginable experience. Being around people was typically a source of pain and loneliness for me because I couldn't connect no matter how hard I tried, but being alone was the fulfillment of my every fantasy.