How can I gently communicate that my feelings for her have changed without hurting her or damaging our mutual friendships?

Little about us: This is both our first relationship—I'm an atheist, non-vegetarian, and an extrovert, while she comes from a super religious family, is a vegetarian, and is an introvert.
I know that it sounds like we are two extreme ends of a rope and its definitely is the case.

Background: My girlfriend and I were enrolled in the same class at the same university. After the academic year began, we got in touch. She didn't initially seem interested in dating, and I didn't hold out much hope for anything. Just before our senior year, I gradually persuaded her of my feelings. She didn't think that of me and wasn't sure about it at all. Even though a lot happened at the time, our friendship remained intact. It has been more than a year since she accepted my proposal one lovely day (I was prepared for anything, even though it surprised me).

We've been happy together and have met each other's parents, though they don't know about our relationship. While we've had intimate moments, I'm not ready for sex, but she wants it. My feelings for her are fading, and I often avoid calls or meetings, though we text daily and mostly have good conversations. I don’t want to continue because I feel we’re wasting each other's time, our goals don’t align, and she deserves better. As she's an introvert, I’m worried about hurting her and how it might affect our mutual friends.

Recently, I’ve been staying away from social media to focus on my studies (she’s not the reason they’re affected). How can I express that my feelings for her have changed without hurting her or disrupting the friendship between us and our mutual friends?

How can I gently communicate that my feelings for her have changed without hurting her or damaging our mutual friendships?
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