Baby not sleeping

My daughters a month old and i still don't know how to put her to sleep. 😩 I feel like a horrible mom. She has no schedule her night and days are mixed up & idk how to fix any of it. I make sure lights are on & tv is playing during the day & that it's dark and quiet at night but it doesn't help. She sleeps all day and stays up all night or will sleep only for 2-3 hrs. She eats whenever she wants and then will go back to sleep. I have such bad stress & anxiety about this. I feel like i'm doing it all wrong. Can someone help me or give me suggestions. I'm only 16 idk what to do