18 month old aggressive?

My daughter is very mean majority of the day, to the point where she’s not enjoyable to even be around. She’s constantly scratching, pulling hair, screaming crying, pulling my glasses off my face, pinching. I also have a 4 year old son and they fight 85% of the time. Is this normal? She is also very glued to me and literally makes me hold her so much or else she just screams until she hyperventilates.

Is the aggression normal at this age? So worried. How do I correct it? My son was never like this.