so the bike does not fit, and you are damaging your body.
you are 20 years old. wanna spend the next 60 years limping?

you are a few days into a long tour, and already in pain.
assume still somewhere in portugal. it's decision time!

continuing the current tour under these conditions is unwise.
first, can you switch bikes with your riding partner?

take a few days, a week, to rest, you and your partner can check
the maps.......find a less extreme route. no climbing, shorter days.
more time spent seeing the sights on foot, less time in the saddle.

google you some bike shops in amsterdam, see about renting
a bike from a shop there. one that can store your bike...or
sell it on commission.

how about a tour of holland and northern germany?