Losing weight??

Hi guys, I've been trying to lose weight for years and my body gets me really down. I have a boyfriend and he says he loves my body but I can't even let him see me even though we've been together a year and I just hate myself a lot. I walk a lot, I don't really eat much but sometimes I do snack a bit too much but it's like an odd day and it's not too much. I do taekwondo two times a week; and recently had been going on hour / half hour walks. What else can I do to lose weight? And I worrying because it's Christmas soon and I don't wanna gain holiday weight either. Thanks. Xxx