i hate .. Main nafrat krti hu...(if the speaker is female) i hate... Main nafrat krta hu...(if the speaker is male)

मुझे नफ़रत है ! (Mujhē nafarata hai) means I HATE ...

Actually most people are using the word Nafrat which is originally an urdu word. Proper hindi would be ( main tumse ghrina karti hoon-I hate you)

I hate - घृणा करना or द्वेष In hindi - mujhe ghrina/घृणा hai

I hate……. is not proper sentence you have to add something behind hate i.e. I hate you in Hindi Me tumse nafrat karta hu (मैं तुम से नफरत करता हू)