I am the main breadwinner through circumstance really. I earn £20k and DH earns £16K. We split the bills as evenly as we can - he pays the rent, his and DSD's mobiles, Netflix and his loans and I pay everything else.
I do sometimes resent being responsible for buying all the food, running the car, keeping the house going, clothes for the kids and so on but it's just the situation we've found ourselves in.
DH is very good at housework and cooking, he does more than his fair share. We both do school runs and things are ticking along nicely.
In 2 years I will have paid off some debts so we should be much more comfortable (at the moment we're always down to our last £20 at the end of the month).
I have worked hard to get to where I am career wise, I've got room for progression in my workplace and have undertaken numerous training courses, NVQ's and the like over the years to allow me to get the job I have now and I'm proud of that. I do wish DH had applied himself more so he could say the same, as opposed to working for minimum wage but it is what it is and we have a roof over our heads and food in the fridge 
I'm actually very grateful for what we have.