I hate Microsoft support this is stupid, I've lost the email to my other Microsoft account...

First thing you need to do is to recover your account:
http://support.xbox.com/my-account/microsoft-account/lost-password-solution

If that does not work, you may contact Xbox Support for other options to recover your account: http://support.xbox.com/contact-us

Once you have access on your Microsoft Account, you can change your sign-in email address: http://support.xbox.com/my-account/microsoft-account/change-email-sign-in-for-microsoft-account

And can I do it without losing all my progress on my games I own?

And when I do the support my information is good enough for them to recover it but they don't

I've also lost my alternative email and I'm not trying to lose all my progress on Fortnite which I've been playing for a few years

Check this link out for a "How-To" on
Closing Your Microsoft Account

Good luck and take care!

This is how to delete my email account, not this windows live thingy **** that's impossible to delete, xbox account thing, I want my email as said, but not this stupid account linked to it.

I've known for the longest time how to delete my email account, so I don't need help on that.