I can’t orgasm

I’ve never had an orgasm in my life . I love my boyfriend with all my heart but I always lie to him when he fingers/fucks me ( I tell him I came to make him feel good ) I don’t know why I started lying to him in the first place because I’m sure he’d help me figure out why I can’t have an orgasm but the thing is I don’t want to tell him I’ve been lying to him .. I don’t get turned on when I touch myself , and I do get turned on when I do things with him but it’s mostly mentally .. I’ve never had any physical orgasm or even felt turned on down there .. can someone give advice ? Am I doing something wrong ?