From the May 1968 edition of the teen mag FAVE, an amazing letter from Leonard Nimoy (speaking for Spock) to a mixed-race girl who was struggling with fitting in.
1968 Article "Spock: Teenage Outcast"
The article is interesting in that it was Nimoy's response to a fan letter from a mixed-race girl that was struggling with fitting in. There is real concern and thoughtfulness in his response, and it was both interesting and compassionate; as he framed his advice in the form of telling how young Spock might have dealt with the stresses of feeling excluded from the group and being bullied. He used the fan's interest in the character, and how they related to the half-human, half-Vulcan Spock, to share some down-to-earth encouragement.
Her heart-breaking letter:
Dear Mr Spock,
I am not very good at writing letters so I will make this short. I know that you are half Vulcan and half human and you have suffered because of this. My mother is Negro and my father is white and I am told this makes me a half-breed. In some ways I am persecuted even more than the Negro. The Negroes don't like me because I don't look like them. The white kids don't like me because I don't exactly look like one of them either. I guess I'll never have any friends.
F.C.
Los Angelese, Calif
and an except from "Spock's" answer (see the full text in the image at the link):
Most of the Vulcan kids didn't like Spock because he was half
human. So they wouldn't include him in all the things they did. He was very lonely and no one understood him. And Spock was heartbroken because he wasn't popular. But it was only the need for popularity that was ruining his happiness. The question was: which was more important, being 'popular' with the pack who might turn against him at any minute or being true to himself?It takes a great deal of courage to turn your back on popularity and to go out on your own.