Yes, I think at the end of the day, if you've added up all your 'expected' essential expenses including annual/one off ones like insurances and car servicing and repairs and white good replacements and so on, and you're then finding there's not enough for your day to day or discretionary spending, you've either not got enough money coming in for the lifestyle you want to lead, or you are wasting money somewhere else in the budget, or a little of both.
I'd set aside some time to do a really honest budget, starting with the definite essentials (including as above annual/one-off ones, and be realistic or even pessimistic, if you drive an older car include it needing some work done, unless all your appliances are brand new assume one at least will break every year). Then once you know how much you have remaining, allocate some to genuine, long-term savings goals (not to dip into to meet essential living expenses or for 'wants' like holidays or Christmas, this is going to come later). How much this is varies on your income and stage of life and goals, it might need to be a lot if you are aiming to move house or other big expense, or only a little if you already have a reasonable emergency fund and no other pressing goals.
Only once these things are fully accounted for can you allocate other discretionary spending. This includes everything other than essentials, i.e. children's activities and ancillary items like costumes/kit, gifts, eating out, days out, holidays, personal spends for you and DH/DP. If you're lucky enough to have plenty of discretionary spending you can leave all of it in one big pot and just spend as you like but for most of us we need to do some kind of prioritisation exercise. E.g. if we want an annual holiday abroad we then need to keep other days out fairly cheap and local. If your child wants to go on the expensive school ski trip they can't also have a new iPhone, and so on. Personally I'd really look at things like subscriptions, casual eating out, small treats for yourself and the DC, frittery type of spending that isn't very much in itself but adds up over time. I think like other people say I utilize a bank account with pots for bigger things like holidays, birthdays, Christmas, then divide remaining discretionary spending 4 ways, not entirely equally although DH and I have the same for ourselves, 1. Children's costs (activities, friends birthdays, clothes, haircuts, school stuff) 2. Family costs (takeaways, eating out, subscriptions, days out) 3. My personal spends (clothes, beauty, hobbies, gifts for DH and my friends/family, occasional coffees or lunches at work) 4. DH's personal spends (ditto). These are allocated monthly and once they're gone they're gone, so if for e.g. I'd bought some expensive clothes and a nice gift for a friend from my personal account as well as my regular standing payments for the gym etc, I probably wouldn't have enough left for lunch out at work by the end of the month so would have to bring sandwiches from home, but it's a lot easier to know that's the case compared to having everything in one big pot, because I can see my account is empty rather than it looking like I have lots of money left (but in reality this is needed to pay DD's terms fees for dance and the car's MOT and the gas bill and so on)...