Is it wrong of me to do this?

Ever since I have been with my boyfriend he has never made me cum. The only time I have came is with a vibrator stimulating on my vagina (on top not in). Is this wrong of me to make him think he is able to make me cum? Should I tell him? I don't want to sadden him. Is there something wrong with me? The only time I am able to cum is with a vibrator stimulating (am I even using the right word for this) me. It comes to a point I barely even get wet when we are in the moment even when I am horny because I know he wont satisfy me to point to make me cum. I mean I love the journey just not the end. If I do tell him, how do I tell him? How do I start this conversation? I have been lying to him since we started dating.

Update 1: I told him now I am waiting for a response

Update 2: He took it well and we talked about it and different ways we can try and make me orgasm. He is not mad but I can't keep things in all of the time.