See? You are doing it again. You haven't done anything to ruin your day. What has ruined your day is that women's clothes aren't made in your size. Guess what? I'm a cis-woman and currently, I am wearing men's jeans (because women's jeans are too short, too narrow in the waist and too big in the hip), a man's t-shirt (women's t-shirts are too short and too narrow in the shoulder) and men's socks (I have big feet). Women's clothes aren't made in my size either. That's not my "fault" and it isn't your "fault" either. Stop blaming yourself.I've managed to ruin my day anyway.
I wish I could say something helpful about losing weight but I find I'm thin when I am busy and focussed and fat when I am not. A friend of mine did say that they found ready-meals useful when dieting because they make "portion control" easy. That might be a step in the right direction without having to wait until you've learnt to cook.