Hi vaneskka1998
welcome to the Apple (user-to-user) Community!
Re: "My apple ID won't update" : "tried to change my apple ID e-mail because the old one doesn't work"
Apple support have an article online (link below) that may help you change the Apple ID email online:
If you no longer use the email address that's associated with your Apple ID, you can change it.
You won’t lose access to your contacts, purchases, or other account information
How to change your Apple ID to a different email address:
Change your Apple ID - Apple Support
If needed: How to: Get a verification code and sign in with two-factor authentication - Apple Support
or
For more support
Apple ID Support website (info. / support / contact (online chat, phone, email etc.)
Apple ID - Official Apple Support
All the best :-)