The procedure was to create a wallet in the blockchain.info and send the miner the information about my wallet, including the private key.
I NEVER SHARED my private key after i funded.
You shared it BEFORE you funded it. The private key has literally nothing to do with 2FA or any passwords of any kind. If you share it once, then it is compromised.
This is possible to happen? Is it possible for a miner to steal my btc without the private key? All this is a scam? Have i lost all my money?
Read above. Another alternative is: Downloading some software that compromises your system.
With these information my wallet in theory was connected to a S9 Antminer equipment.
Obvious scam. When mining, all you need is a deposit address to receive payouts, no *other wallet information*.