Today I couldn't remember my password (I tried the 6/7 that I usually use and none allowed me to access) and so I created a new wallet and entered the seeds I had saved.
What you wrote implies that you kept the password in your head, not on paper or in any other way that would very likely prevent something like this from happening to you. Although you most likely downloaded the fake wallet, there is a possibility that you have a keylogger or RAT (remote access trojan) on your computer and that your seed has been compromised in this way.
What happened? I've lost everything? Please help me
No one here can help you get back what was stolen from you, but you can try to report it to the police in your country, although for such a small amount they probably won't move a little finger. Let's put it this way, you paid for one life lesson, some would even say cheap, even though it may be a lot of money for you.
If you keep investing in BTC, try to figure out how things work first, or some other accident will await you sooner or later.
