My girlfriend (25F) doesn’t want to do something sexually that I (27M) would like to try, and it’s starting to bother me. How do I handle this?

My girlfriend and I have been together for almost 3 years and have a good relationship overall. We communicate well, have an active sex life, and care about each other a lot.

The issue is that there’s one sexual activity I’m interested in trying, but she has made it clear that she isn’t comfortable with it and doesn’t want to do it. I’ve brought it up a couple of times over the years, but her answer has always been no.

I respect her right to have boundaries, and I don’t want to pressure her into anything she doesn’t want to do. At the same time, part of me feels frustrated because it’s something I’ve been curious about for a long time.

I’m trying to figure out whether this is simply something I need to accept and move on from, or if it’s normal to feel disappointed when a partner isn’t interested in something that matters to you.

For people in long-term relationships, how do you deal with sexual incompatibilities when neither person is really wrong?

TL;DR: There’s a sexual activity I’d like to try, but my girlfriend isn’t comfortable with it and doesn’t want to do it. I respect her decision, but I’m struggling with my own frustration and wondering how others handle situations like this.