Me and my gf have been dating for over 3 years now. Earlier we used to live in separate hostels so got to have sex once in like 2 months whenever we stayed out. Recently she moved into an apartment naturally we thought we'll have more sex and we did initially but now she doesn't want to do it that much. We do it like twice a month. Wherever I approach her she makes an excuse and stops me.
Today she tells me that she didn't actually orgasm for the first one year in our relationship (she says she thought she orgasmed but later realised that she hadn't). Upon asking further she said that the reason she does not want to engage in sex is that she's afraid that she won't orgasm.
Also recently I gifted her a vibrator that we use while having sex and she does orgasm everytime we use it but apparently she feels it's incomplete. What can I do to make her orgasm better and make her feel fulfilled? It's getting in the way of our relationship and making us annoyed and cranky.
TL;DR my (22m) gf (22f) told me she didn't orgasm for the first year of our relationship and even now when she does she feels it's incomplete. This has lead to very little sex between us. How do we overcome this?