Should I tell my boyfriend I used to be a webcam girl?

To be able to sustain myself and pay for uni, I used to be a webcam girl, but I didn’t use to always show my face except it was with a trusted client. This was 7 years ago. My boyfriend and I are really getting serious and have asked me to marry him. He has morals like he calls it and raise his nose against things like that. Should I tell him about what I used to do or just leave it in the past? I really love him and don’t want him calling off the marriage plans if I tell him.