Sex pain & positions

Hi I am 17 and I have had sex 2 times now but me and my partner are having a hard time finding a position that doesn’t make me hurt. We can’t do anything obvious just Incase someone walks in because I’m not aloud to have my door closed. Both time we haven’t been able todo it for so long because It hurts me a lot. Is it normal for it to hurt the first few time? What is a great position for it not to hurt & not be obvious??