You should understand the reaction and what your parent felt, they felt betrayed, you failed them, and they thought they could trust you because you are their son, there's nothing you can do but accept their punishment and harsh words.

The best thing you can do is to repay the amount you lose and regain their trust by not playing again until the time that you can sustain yourself and gamble with your own money.

Parents can easily forgive their children that tries to mend their ways.