It feels that when I was much younger, I felt that it was okay to love everybody. I always liked being around people and wanted to know about them, where they were from, what they had seen and done, etc.
Then there was a period of my life where I tried to adopt the customs of the culture of my birth and spend myself on one person to the exclusion of others. I found this bothersome. Additionally, I grew annoyed as different friends did the same thing and, for periods of time, would vanish from my life (I still find this one bothersome).
I have since been trying to unlearn that bit of programming, and recapture what I remember as a fascination with everyone and with learning more about the world and the people in it.
There is so much still there to unlearn and I suspect I will never learn to love as completely, to accept as completely, and to experience as thoroughly as I could when I was very small.
(not to say childhood was perfect -- I was quite a terror, too! Very hyperactive and such, compared to my sedate, relaxed self now)