The 25-year-old "Bad Blood" hitmaker came across a post of a fan on Tumblr, who said she was alone, left out and "terrified of school starting" next week, reported E! Online.
The singer responded to the fan and said conquering fears is the most thrilling part of life.
"I hate that you're feeling this way and it's so hard not to dwell on our fears and doubts... But in reality, we just have to go through life not knowing what's next. It's scary but it's also the wildest, most thrilling part of life."
"Knowing your worth sometimes comes without any proof at all. You're worth more than flaky friends and people who dismiss you or underestimate you.
"Sometimes it seems like that's all you get, but it's not all you'll ever get. Believe that. Love you," she wrote.