Is there a way to change currency inside the EU?

[whodis]

Apparently, only learned today that there's an EUR currency as well. Up until now, i had been using GBP instead of Euro and kept paying more than i should (Instead of buying 1 month for 10€ i was paying 13€).

I'm getting tired of having to buy 20€ paysafecards / spending 13€ from debit card every time i want to buy 1 month.

Is there a way to change currency to EU?

I'm not even from the UK, which makes it even funnier that they automatically set it to GBP instead of EUR.

(This is in the mogstation by the way)