Kristen Stewart looks back on 'uncomfortable' 'Twilight' years: 'It kind of forced me to stand to attention'

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

PHOTOS: The 'Twilight' cast through the years

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US actress Kristen Stewart poses on the red carpet upon arrival for the premier of 'The Twilight Saga: Breaking Dawn - Part 2' film premier in Leicester Square, central London, on November 14, 2012. AFP PHOTO/ANDREW COWIE (Photo credit should read ANDREW COWIE/AFP/Getty Images)
US actor Taylor Lautner poses prior to the German premier of 'The Twilight Saga: Breaking Dawn - Part 2' film premier in Berlin on November 16, 2012. AFP PHOTO / FREDERIC LAFARGUE (Photo credit should read FREDERIC LAFARGUE,FREDERIC LAFARGUE/AFP/Getty Images)
LONDON, ENGLAND - JULY 01: L-R Alex Meraz, Booboo Stewart, Nikki Reed, Kellan Lutz, Ashley Greene and Xavier Samuel attend the Gala Premiere of The Twilight Saga: Eclipse held at The Odeon Leicester Square on July 1, 2010 in London, England. (Photo by Dave Hogan/Getty Images)
ATLANTA - MARCH 19: Kalin Wilson reads a book while waiting for the New Moon cast members to arive the 'The Twilight Saga: New Moon' DVD release at Blockbuster Brookhaven on March 19, 2010 in Atlanta, Georgia. (Photo by Annette Brown/Getty Images)
THE TWILIGHT SAGA : BREAKING DAWN - PART 1 - 2011 Summit Entertainment, LLC film with Kristen Stewart and Robert Pattinson.
THE TWILIGHT SAGA'S BREAKING DAWN PART II - 2012 Summit Entertainment film
Poster for the Twilight Saga Breaking Dawn Part 2
Cast member Kristen Stewart poses at the premiere of "The Twilight Saga: Breaking Dawn - Part 2" in Los Angeles, California, November 12, 2012. The movie opens in the U.S. on November 16. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT PROFILE SOCIETY)
Actress Kristen Stewart arrives at Nickelodeon's 25th annual Kids' Choice Awards in Los Angeles, California March 31, 2012. "Twilight" star Stewart, 21, was named favorite movie actress at the award. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)
Cast members Robert Pattinson (L), Kristen Stewart (C) and Taylor Lautner pose at the premiere of "The Twilight Saga: Eclipse" during the Los Angeles Film Festival at Nokia theatre at L.A. Live in Los Angeles June 24, 2010. The movie opens in the U.S. on June 24. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
"Twilight Saga: Eclipse" Premiere and Photocalls - 28 Jun 2010
Actors Taylor Lautner (L) and Kristen Stewart pose during a photocall to promote their movie "The Twilight Saga: Eclipse" in Stockholm June 21, 2010. REUTERS/Bob Strong (SWEDEN - Tags: ENTERTAINMENT)
U.S. actress Kristen Stewart poses during a photo call to promote the movie "The Twilight Saga: Eclipse" in downtown Rome June 17, 2010. REUTERS/Max Rossi (ITALY - Tags: ENTERTAINMENT)
Actor Taylor Lautner, who stars in the upcoming movie 'The Twilight Saga: Eclipse', poses for a portrait in Los Angeles June 12, 2010. Picture taken June 12, 2010. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT PROFILE)
Cast member Kristen Stewart poses at the premiere of the movie "Twilight" at the Mann Village and Bruin theatres in Westwood, California November 17, 2008. The movie is based on the novel of the same name by Stephenie Meyer and opens in the U.S. on November 21. REUTERS/Mario Anzuoni (UNITED STATES)

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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