Girls, who feed the baby, tell me, do you express or not? How do you f…

Girls, who feed the baby, tell me, do you express or not? How do you feel? I fed for a week and didn't express, relatives were breaking if I don't start expressing after each feeding then three months won't hold out so it will burn out... I expressed for a day and the breast felt like "blown away", I don't feel any surges anymore... and the little one started hanging on me, getting fussy... What should I do now?