OP it sounds horrendous
it should be a special day, something that you both want, whatever it is.
To be honest, planning a wedding for 2 YEARS sounds horrendous (I had nearly 200 guests at mine, but 2 YEARS?)
Who are you planning the wedding for? you, your kids or your relatives?
Every penny you spend is money you don't spend on your own children. Don't you want to put them first?
It's so not too late to change your plans, downsize, scale down or just elope.
You need to start being the adult and being in charge, who cares if you are "expected to"? By whom? you are the one paying, you have kids, do what you want.
First be honest with yourself, is your issue being the centre of attention, or is it the money? It's one day, and you already have kids, it's not worth spending months about what is only a big party.