Kristen Stewart Looks Back on 'Uncomfortable' 'Twilight' Years: 'It Kind of Forced Me to Stand to Attention'

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Kristen Stewart is opening up about a significant time in her life.

The 26-year-old actress recently dropped by The Ellen DeGeneres Show, airing Friday, marking her first time in five years. The last time Stewart was on the popular daytime show was in 2011, when she appeared with the entire Twilight cast to promote The Twilight Saga: Breaking Dawn - Part 1.

"I feel like I'm looking at a college yearbook," Stewart says when DeGeneres pulls up a picture from her last visit. "I don't jump right back into those memories but as soon as you see pictures, you're like, 'oooh God, it's like yesterday' ... and then maybe not."

WATCH: EXCLUSIVE: Kristen Stewart  Opens Up About Feeling More 'Uninhibited' in the Public Eye, Has 'Twilight' Reunion

The actress admits it was a pretty "awkward" time in her life.

"I was 17, 18, when it all went down and that was the most uncomfortable, terrible, weird thing -- you're, like, 17 years old, 'Ahhh!'" she explains. "At the same time it's good. It kind of forced me to stand to attention in this way, which, I didn't have that."

"When I do stuff that really scares me I feel like good stuff happens," she adds.

But the notoriously private actress says she's only "relatively" shy.

"It depends, you know -- only on the weekend," she jokes.

WATCH: Kristen Stewart on Where Robert Pattinson Romance Went Wrong -- 'Our Relationship Was Made Into a Product'

These days, Stewart is certainly more open than ever when it comes to her personal life. The Clouds of Sils Maria star is rumored to be dating 34-year-old musician St. Vincent, and the two made their first public appearance together last month at the CFDA/Vogue Fashion Fund Show and Tea event.

Earlier that month, the two also held hands in New York City after a dinner date.

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