The actress has been appearing in the role of Eva Price for nearly a year and has been tipped for bigger storylines after having her contract extended until 2013.
Tyldesley told The Mirror: "I've always wanted to be in Corrie. So when I got the phone call to tell me that I'd got the part, I was thrilled to bits, especially with this character. She's got so much scope.
"At the minute, I hope they'll keep me for a long time. If I'm still here in five years' time and loving it as much, then I'll be really pleased. The writing is fantastic and it's such an honour to act every day."
The 28-year-old added that she isn't often recognised by fans in the street.
She explained: "I wear glasses and I don't dress as glamorously as Eva. Only the other day, an old school friend of my mother's said, 'Oh, your Catherine looks like the girl on Corrie'. And my mum had to point out that it was actually me!"
Tyldesley has previously appeared in Emmerdale and Lilies.