My dear @NeedSomeAnswersPlease , I say this kindly - your problem is your mental attitudes and not your holiday plans.
You need to learn how to handwash small clothes items like underwear .
You need to get over some of your issue, like your father seeing underwear drying. I assume he’s has sex at least once so he must know that women wear underwear.
If you are having regular leaks during your period then you need to look at other types of San pro that might work better for you.
You can re wear most clothes and shoes. Please see my comment about “stinking “ upthread .
You don’t need a complete new outfit for every day, let alone two outfits.
Rain in the Netherlands in August doesn't mean it will be freezing cold. You need several thin layers and waterproofs, not one thick layer.
Shops in the Netherlands are just like those in the UK.
You need to learn to simplify your complicated hairstyling and beauty routine, even for a few days on holiday. This will free up more time and space for you to enjoy yourself.
You can cope with something that is less than perfect for a few days , like a hairdryers that is not your own and only one hairbrush for blow drying. You can look nice without looking like a model on a shoot.
You can learn to do without so much stuff for one weekend. It’s not about “making sacrifices “, it’s about being more free to enjoy the experience. Somewhere you have picked up the idea that stuff = happiness/ security.