This person from my high school on facebook tends to evoke a sentiment otherwise almost alien to me: ENVY. It's not that I'm a stranger to insecurity or maybe even jealously, but envy is a special case of such sentiments, it's almost a grievance.
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Unwarranted, of course, because what said person is out doing in their life has literally nothing to do with me. I think it's because I can easily transpose myself into their shoes, and be like, I could be doing *that*, if I had pulled off the last X years differently. That's what makes Envy personal, compared to generic insecurity, I suppose: these sense that, "you're in my place!11"