Do i actually get proper erections?

helloo im 14 and ive started watching porn and when ever the boy/man gets an erection in porn there foreskin comes right back by its self when they get an erection. my penis doesnt do this it gets erect but my foreskin stays as it is. is this normal? does anyone know how to make my foreskin come back by its self when i get an erection please help/reply thankyouu . (: