Sorry if this is not what you guys want to hear, but I feel like it's maybe relevant at this point in the thread.
There are always going to be people with more money than us, or a bigger house, or richer parents, or prettier children, or a better holiday. There are also people with way less money than us, people with husbands/partners who beat them, people who are homeless, etc etc. It's just life.
If watching someone on YouTube or instagram is genuinely making you feel sad and unhappy with your own life, it's maybe time to stop following them. Because your own self-esteem and mental wellbeing are really important, and too precious to allow them to become dented by what you're consuming on social media.
And no, before you ask, I"m not Katie, but I do watch some of her YouTube videos and I think she has way more integrity than the vast majority of mummy floggers.
Absolutely no offence intended by this post to anybody at all, I just felt saddened by what I'd read in some of the posts above.