Feeling like a defeated, bad mother

I know it sounds crazy, but my 9 month old daughter is like a nightmare to handle. I love my baby girl so much but she’s so badly behaved for a baby her age

She slaps me, pinches, kicks, screams and cries alllll day long. being a stay at home mom for 16 hours a day with her is taking its toll on me.

She never seems content with ANYTHING. I put on her show and give her some snacks and in 5 minutes she’s crying or fussing.

I leave the room for ONE second, she’s crying and screaming.

She even throws fits when I feed her.

Putting her down for a nap is chaos. She’s exhausted but fights sleep with every bit of her.

I can never get anything done around the house, or take time for myself to cool down and relax. The most she naps is 15 minutes.

I can’t help but feel like I’m a horrible mom for getting frustrated and upset. I don’t know what to do anymore 😢