“A person can be lonely even if he is loved by many people, because he is still not the "One and Only" to anyone.”
29 December 1943
The Diary of a Young Girl (1942 - 1944)
Variant: You can be lonely even when you're loved by many people, since you're still not anybody's "one and only".
Source: Cliffs Notes on Frank's The Diary of Anne Frank
Original
Een mens kan eenzaam zijn ondanks de liefde van velen, want voor niemand is hij toch "de liefste".
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Anne Frank 110
victim of the Holocaust and author of a diary 1929–1945Related quotes

Srimad Bhagavatam Canto 3 chapter 23 verse 8, Bhaktivedanta Book Trust, (1972) Vanipedia http://vaniquotes.org/wiki/Love_of_God_is_not_an_ordinary_commodity._Caitanya_Mahaprabhu_was_worshiped_by_Rupa_Gosvami_because_He_distributed_love_of_God,_krsna-prema,_to_everyone
Quotes from Books: Loving God
“Don't consider anyone smaller than you, because he only becomes a bad person by going ahead”
Source: https://en.everybodywiki.com/Parth_Siddhpura

“I have so many different personalities in me and I still feel lonely.”

“I feel the madness creeping slowly. Loved by many I'm still lonely.”
In the song "The Westerner"

Source: He's Just Not That Into You: The No-Excuses Truth to Understanding Guys
Source: How to Win Friends and Influence People