The 25-year-old actress, who plays Tina McIntyre on the ITV soap, said that she couldn't believe how far she had come in a relatively short amount of time.
Speaking on today's (September 6) edition of Lorraine, Keegan recalled: "I always wanted to be an actress but I thought you had to start at a young age and I didn't know how.
"I started acting at 19, and was just really lucky. It was a case of right place, right time."
Keegan went on to admit that she continues to gets "starstruck" by some of her Coronation Street co-stars.
'I'm still starstruck by most of them," she said. "It's really weird because I grew up watching Corrie and I still have to pinch myself that I'm actually still there."
Keegan's character is currently at the centre of a controversial surrogacy storyline.
The actress herself was recently reported to be dating rugby star Mark Flanagan following her break-up with The Wanted's Max George.