Aitah, for not wanting to go Lego land after my girlfriend booked it with her family and added me on without asking me?

So I(19m) have been with my girlfriend(20f) for 3 years and recently her family mentioned going to Lego land with the kids and I never said I wanted to go with because Lego isn’t my thing and I’ve got other stuff to pay out for. My girlfriend booked it all without asking me if I wanted to go and put me on it anyway so I offered to pay for my half so she didn’t waste any money and she can still go and enjoy it with her family.