I think you need to give your head a wobble.
You have parents who care for you.
They have accommodated you and your children in a property and because you feel you've outgrown it they've bought a larger property for you, with your input too viewing together.
They charge you less than market value rent
You've not needed to jump through admin hoops of affordability.
You won't be dealing with a local estate agent managing the rental, who will turn up frequently to inspect the property which in my experience can feel invasive.
You will likely inherit any cash and property within the next 10 years or so.
Now compare that to someone in your situation who is stuck in cramped accommodation, paying eye watering rent, with no caring patents or parents who are in a position to financially help.
You sound spoiled to be honest, I was surprised you were in your 40's to be honest. By the way you came across I initially thought you were young and immature, in your 20's.
I mean it's kitchen cabinet doors, like I say give your head a wobble. Maybe you should do some volunteering with something like woman's aid to give you perspective of how lucky, cared for and supported you are in your life.
Try and be more grateful for your blessings and less selfish in life, you'll feel happier and save your energy.