The Christian star was abused online for being "too posh."
Speaking to the Mail on Sunday's You magazine she said: "During Bake Off, my faith was a huge source of comfort and confidence, especially when I was being criticised on social media for my appearance, which was really horrible.
"My faith gives me a sense of perspective.
"I am well aware there are more important things in life than baking a perfect ciabatta, and there's nothing to be gained in reading vile abuse on social media.
"Just because I live in Ascot and speak a certain way, people thought I was posh. I'm not, as it happens, but so what if I were? Why should that matter to anyone?"
Ms Collison was 17 when she appeared on the Bake Off and was criticised online for being "posh" as well as for her looks.
Her interview comes amid rumours the show, which attracts millions of viewers, would move to ITV.
Martha Collison has baked for the Queen's 90th birthday and the 19-year-old has written a cook book.
