My friend has asked me to do a charity fitness boot camp with her next Saturday because I have just started trying to lose weight. It's lovely of her to ask but I feel like I'll either be the fattest one there and everyone will wonder what I'm doing there or that I'll just not be able to do any of the circuits and ill feel really disheartened. I've looked on the company's Facebook page and all of the pictures are of for people. I want to do it but with such low confidence plus being the biggest I've ever been at a size 18-20 I don't want to put myself in a position where I'll feel stupid. What would people advise I do?