<human>: I have been with my girlfriend for almost six months. We started having sex about a month into the relationship and I until recently thought we had a pretty good sex life. A little while ago she told me that she had never actually orgasmed. Ever. I was pretty shocked because I thought she came most times we have sex. When I questioned her about it she got visibly uncomfortable and said that she pretended because she didn't want me to feel bad. I see why because I feel terrible now. I asked if she even enjoyed sex and she replied "I think so, its fun I guess." 

I have always been pretty confident sexually so this came as a bit of a blow. Thinking back I should have noticed something was up because she doesn't masturbate or let me go down on her. I did try a few times but I eventually gave up because she told me she doesn't enjoy it and was pretty firm about not letting me. 

I have had other sexual partners in the past and this has never been an issue. I feel awful now I know she has been having sex with me just to make me happy. I tried bringing it up again a few days later but she didn't want to talk about it. 

She comes from a pretty strict religious family and I think maybe she might have been taught that she wasn't supposed to enjoy sex. I don't think there is anything wrong physically, she gets turned on and sometimes initiates things but I think she might be telling herself not to enjoy it. She has always been shy and a lot less confident in herself than she deserves to be. We haven't really talked much about sex in the past because she gets embarrassed really quickly.

I really don't know how to bring this up. I really don't want to have sex without her getting off too. It seems to be a sensitive topic for her and every time I try to approach it she shuts the conversation down. 

Advice?

Can you summarize the given text in a few sentences?
<bot>: Girlfriend has never orgasmed and doesn't really enjoy sex. She doesn't like talking about it and I am unsure what to do.