not been having sex

Me and my boyfriend haven't had sex for about 2-3 weeks. 1 of them being my period, however I've just not really wanted it. We both live with parents still so we never get chance to be alone and do it, and I can never get horny. Really annoys me when I do want it but I don't want it to be forced and unpleasurable. I don't know what to do): how can I do it without parents being home anddd how can I get in the mood