Well yesterday i saw they added the option to add my email and a password to log-in into my account, so i made it and i receive the email with the confirmation.
Today i tried to open my account via the ussual log-in with my email and password set up yesterday and it open...... but it wasnt my account

it was like a new account with 0 balance..... i close it and open again with Metamask and there it was my acount i go to settings and it was the email set up correctly, so i dont know maybe is some bug or problem with the database. Maybe they still need to cross it or i dont know, but i hope it help to fix it.
In this case, you simply created a second account, since—as far as I know—you can’t just switch an existing MetaMask account to email and password login—at least not easily without help from support. That, of course, explains why you no longer had a balance in your account

However, there might be a way to link the two accounts so that you can actually use email and password for the Metamask account now. Customer support can surely help you with this!
Whale.io probably has the most horrendous login system among all the crypto gambling sites that I have personally used so far which is primarily why I lost interest in playing here. Am not at all surprised about the issue that you faced which makes their login system worse.
I suggest sticking to what works which is metamask in your case. Don't fix what ain't broken basically.
What specific issues are you referring to? I log in to various platforms regularly, and the login processes are all quite similar; in my opinion, Whale doesn’t stand out negatively in this regard.