I can't come

I have tried lots of things but i just can't come. It seems to me that I have never comed as people say that they get this rush of feels over their body when it happens and that it's amazing. Me and my bf have tried everything and different positions but that doesn't really do much. There is this one move that we do that hits the spot for a couple of seconds then nothing. I'm not sure if I have ever come,my bf sometimes says to me "come for me baby" but I just can't any tips or anything, I want to know how it feels...when my bf is done and he knows that I didn't come he feels like he didn't do a good job...we have talked about it and he understands but I just want to be able to feel the feeling. Does anyone have any tips or anything that will help I would be grateful.