The actress took over the part of Lauren Branning in summer 2010 and was last night named 'Best Newcomer' at the National Television Awards.
Speaking to PA, the 19-year-old explained that working alongside screen family members Jo Joyner (Tanya) and Jake Wood (Max) turned out to be far less scary than she anticipated.
Jossa commented: "There was less pressure than I thought there was going to be.
"When I first started I got really scared and worked up, thinking everyone's going to hate me. They've been there four years and then I'm coming in to be their daughter - it was a bit surreal.
"And then two weeks later I felt completely comfortable, everyone was cracking jokes and I thought, 'Oh... I built it up a bit!'"
EastEnders fans have recently seen Lauren hit the bottle as she struggles to cope with Tanya's battle against cancer.
> Read Jacqueline Jossa's recent interview with Digital Spy
> Read Jo Joyner's recent interview with Digital Spy
> Read more EastEnders spoilers and news
Watch Lauren's EastEnders character trail below: