Breastfeeding / Pumping breast milk

Hi mummies, FTM here. How long do you breastfeed or giving your breast milk to your little one? I'm having trouble breastfeeding / pumping, so I'm curious and also afraid if I give my little one only formula milk, people would judge me. Of course, I'm trying my best to feed the breast milk. If you have any tips using the breast pump, please share!