The actress - who plays loudmouth Janice Battersby - took the stand as a defence witness as her husband Andrew Chapman faced a charge of assaulting one of her fans.
Entwistle and her partner had been travelling on a train home from Manchester earlier this year when Chapman attacked Michael McWhirter after he asked for a photograph of the star.
At the court hearing, Chapman claimed that McWhirter had a "menacing" manner and had left his wife feeling intimidated, while Entwistle said that the pressures of her high profile had sparked the incident.
According to The Sun, Entwistle told the court: "We have had lots of people, people who can become fixated for some reason. They become obsessed. We always could get away but in this situation there was nowhere to go.
"I'm more than aware that my character is quite controversial. In a way it's flattering that people believe it, but due to this I've had a lot of emotion. In the past 14 years I've become a dab hand at dealing with it.
"This particular incident I find to have been extraordinary. I've decided to resign from my job because I want some form of privacy and normality. I enjoy the work but the enormity of that programme is too big for me now. We live in a rural area and this programme is such a huge machine - I just feel swallowed by it."
Chapman was found guilty of assault at the hearing. Issuing a £1,250 fine and ordering Chapman to pay compensation to his victim, district judge Jonathan Finestein said: "You became far more protective of your wife than you needed to be and lost your temper."
Entwistle announced her decision to leave Coronation Street in August.