fingering...

i’ve been masturbating for about 3 years now and i only masturbate by rubbing my clit...i’ve tried slipping a few fingers in but i can only put in one. if i try to put in two, it hurts so bad. is this normal? i’ve never had sex before and i’m concerned because i have a boyfriend and i’m scared when the time comes, he’s not going to be able to get in without hurting me...i know that it usually hurts the first few seconds but i’m scared that it’s going to hurt the whole time. does anyone else face this problem?