Faking an orgasm

Okay so my boyfriend and I have been together for a little over six months now and lately things have been getting pretty sexual. I've never had sex but he fingers me and stuff like that. Is it bad that he's never made me cum once? Like I want to really badly and he always tells me to cum for him but I just can't, like I feel like I'm taking too long so I just fake it…I feel really bad for lying about it but I don't really know what to do