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

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?