How to deal with guilt/shame surrounding cam work?

Hi hi, I'm F18. I've worked as a professional cosplay model for 3 years but recently started cam-work to help pay for my little sisters care (she's disabled and our parents are absent) I don't mind doing the work, i'm very comfortable with myself and my body, However.. I occasionally find myself feeling ashamed or embarrassed about it. Like i'm a bad person , even though it's just a job and the money really helps. Does anyone have any advice on how to overcome these feelings?