I feel stupid for asking, but I need a third party.
I have recently been looking back into the religion of my youth and I've decided it's something I want in my life. This would mean a few things, but the one in question is not having sex before marriage. I've been sexually active for years and it's something I've enjoyed, but not as much as most people. I am willing to give it up for the next few years.
My girlfriend/fiancée (no date, just decided we want to get married at some point) does not feel the same. When I expressed to her my interest in this religion, she was a little shocked, but asked me to tell her about it. I brought it up early on that it would mean no more sex for now, which she didn't like but essentially said she's willing to wait for me. However, now it's been a few weeks and she is very irritated and said she won't be happy in the relationship unless our sex life goes back to normal.
I would do anything for her, so i told her i would. I'm not very comfortable and it's not something I want, but I feel like I should for her. I feel like it's my fault, but I'm also sad because I feel like she isn't willing to do whatever it takes to make me happy, which i am willing to do for her. Is that a valid feeling? Did I make the right choice, or should i try expressing it to her again?
A little more information: we're both in our early twenties and have dated on and off for about five years. We live separately.
P.S. please feel free to close this question if I posted it inappropriately.