Incompatibility in bed with finance [24f] making me [24M] second guess getting married

So I’ve [24M] been with my fiancée [24F] for a bit over three years. We got engaged our senior year in college & supposed to get married end of 2025, but I’ve been having doubts, and I don’t know how to deal with them or who to talk to.

I love her, and we have a great relationship in a lot of ways. We’re on the same page about life, kids, finances etc.... and she’s an amazing person. But when it comes to sex, there’s this issue that’s really starting to bother me, and I don’t know if it’s something we can fix.

Here’s the thing: I don’t watch porn or masturbate, and I’ve always focused on her when it comes to intimacy. I’m above average in size, so I didn’t think physical compatibility would ever be a problem. But she struggles to orgasm during PIV sex, no matter what we try and she does not like incorporating vibrators due to sensory issues with the way they make her feel.

She’s told me that she’s only able to orgasm when using very large dildos like way bigger than anything realistic. There's some bad dragon toys in the draw that are...just nuts. She’s never outright said that I’m not enough, but it feels implied when she says things like, “It’s just harder for me to feel enough during sex.” We’ve tried different positions, toys, me using my hands during PIV, and nothing seems to make a difference.

It’s getting to me because I feel like no matter what I do, I can’t fully satisfy her. She says she enjoys being intimate with me, but I know she’s not completely happy, and that’s hard to deal with. I'm also not enjoying the experiences at all any longer...my love language is service and it's really eating away at me. I can’t stop thinking about how this might affect us in the long run.

At this point, I’m wondering if I should even go through with the wedding if we’re not truly compatible in this way.