So, it's sounded in all three of your posts over the last year like your girlfriend has been pretty clear she really doesn't *want* to be sexual. She's communicated that she feels very scared of pregnancy, she's communicated that she doesn't feel ready. I strongly suspect that the sex you have had has probably been sex she has had because she hasn't really felt like she has a choice, which is obviously not a good thing for either of you.
The two posts before this I've tried to open conversations with you about her just not sounding like this is something she wants or feels comfortable with, but you've let them just drop off instead of engaging with them. How about we try and have that conversation?
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead