Who said "I think I'm a difficult person."?

This quote is attributed to Marianne Sheridan.

I think I'm a difficult person. - Marianne Sheridan

"I think I'm a difficult person."

Marianne Sheridan

Character in Normal People

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"I don't know how to talk to people."

"I think about you all the time."

"People don't really change."

"Everything feels like it's ending."