Can you buy (or ask your family to buy) lower calorie snacks for you? E.g. fruit, veg, 10cal jellies, low cal popcorn. That way you have healthier choices when snacking. I can easily eat a 200g bag of carrot sticks as a snack, but that’s less than 100kcal, whereas even 1 serving of chocolate is a lot more than that.
How old are you? Are you likely to move out soon? My family always have loads of crisps, chocolate, etc in the house and snack all day. When I moved to uni I lost weight almost without trying. It was so much easier once I wasn’t surrounded by people who were also snacking all day.