Can I change my apple id?

Yes - see the following link: Change your Apple ID - Apple Support

You can change the email address you use as your Apple ID.

For info:

Change the email address you use as your Apple ID

https://support.apple.com/en-us/HT202667

What to do after you change your Apple ID email address or password?

https://support.apple.com/en-us/HT204071

I don't know if this will help, however, you can create a new Apple ID for yourself. For instance I have 2 Apple ID's one for iTunes and one for my iCloud. Both are combined together on all computers and IOS devices. They work fine together, no problem. I choose to do that for keeping things separate.