How do I (20M) create a smooth breakup with my (19F) girlfriend of 2 years?

Ive been dating my girlfriend for just a little over 2 years and the incompatibilities we have are becoming more and more unbearable overtime. She is a great person and she puts as much effort and she can into this relationship, I genuinely feel loved and cared for. Unfortunately the mismatches on certain important subjects to me that I tried to throw under a rug are just becoming more and more prominent. That's why I finally got the courage to pull the trigger, but because she is genuinely a good person and I love her a lot, I don't want it to be a nuke out of nowhere. How do I approach the breakup? Since I'm almost 100% sure she is not expecting it at all, because I was the one who was suppressing some parts of myself for the sake of our compatibility. Is offering a pause a good idea? Or is waiting for a right moment not a great idea? This is my first relationship ever and I don't know how to do this.

TLDR I want to breakup because of compatibility issues, but because I love my girlfriend and she is a good person overall I don't want to hurt her too much. How do I manage this?