Coughlan has earned major plaudits for her role as Penelope Featherington in Netflix series Bridgerton.
After airing on Christmas Day 2020, it did not take long for Bridgerton to become the most popular show on Netflix after it was watched by 82 million households in just 28 days.
Bridgerton series two will begin on March 25, moving towards the romantic interests of Daphne's brother Anthony Bridgerton (Jonathon Bailey).
"Being famous is like being a dog on the Tube", Coughlan told Elle magazine. "It's exactly the same energy. When you get on, everyone looks at you".
"Some people are so smiley while some are afraid of you and don't want to go near", she continued. "Some people touch you without asking. I can still do the things I want to do, obviously, but it is different".
She even recalled feeling like "an animal in the zoo" after visiting the pub.
"And I remember one time I was taking my Invisalign [brace] out, and this person was staring me right in the eyes, which was quite weird", she said.
Nicola Bridgerton also insisted that she would never sell the idea that the world of show business was "wonderful and fun", because it is "hard work".
"Whenever people say they want to get into this industry, I'm like, 'You've got to want it so badly", she stated. "Because if you don't, you'd be mad to do it, absolutely mad".
"I barely saw my family last year because of filming. There's a lot of sacrifices to be made", she continued. "In my twenties, I never went on holiday. I was so broke".
"But it's amazing. I wouldn't do anything else".
Along with series 2, Netflix have also commissioned series three and four, telling the "origin story" of Queen Charlotte who is played by Gloria Rosheuvel.
Coughlan is also known for her role as Claire Devlin in Channel Four sitcom Derry Girls.
"I always find it hard to explain to people about playing characters, that they feel like your friends", Coughlan said on filiming the final season of the sitcom. "I've been playing Clare now for five years".
"So it's like saying goodbye to a friend I know I'll never see again".
