This is one of the times that I realise just how far we still have to go to reach a real understanding and acceptance of human sexuality.
What does it say that someone has to ask if it's ok that they don't like sex?
That they must have something 'wrong' with them if they don't. There has to be a 'diagnosis' or a 'reason' and that they need to find out why and 'seek help'.
Why isn't it perfectly okay to just not like it? There's no other experience in the world that everyone universally likes - why should this be any different?
I know I'm not the first to say this, and that others are supporting the OP, but....
OP, this may just be who you are, and that's perfectly OK. It doesn't make you weird or wrong - it's just another facet of an incredibly complicated spectrum that I don't think we understand half so well as we think we do.
The ONLY thing about any of this that matters is that both you and your partner can reach a compromise in your relationship that you're happy with. And that doesn't (and shouldn't) automatically include you having to try to 'fix' the problem if YOU don't want to.
Are you happy without sex? Do you want to want it? If yes, then go for it, seek help and I hope that it works.
If no, then you need to say that - because it is a perfectly ok thing for you to say. And if you do, then, please, start to believe that you don't need to be ashamed of that, and you shouldn't have to be pressured into anything else anymore than a straight man should be pressured into being gay, or a gay one into a straight relationship. I genuinely believe that this is a normal component of sexuality and you can see from previous posts that I'm not the only one.
You're talking to your partner, and you should carry on doing this, but, if I may speculate a little - is there a sense of 'but I'm normal, it's normal to want to, what's wrong? I'll support you while you fix it, but it must be because.... reason, reason reason' to the conversations?
It MAY be because of your health/history - or it may not.
We come back to - it's perfectly okay to just not like it!
Not all relationships need to be sexual - some people are fine without it - but if your partner isn't then think hard before agreeing to 'try to fix it' if that's not something you want to do. You can't force yourself into something so intimate for years to keep the relationship alive. It's fair to neither of you, and pretending will put your partner into the horrible position where you're either actively encouraging them to use you against your own real wishes or suggesting that there may be a fix when there isn't.
Be completely honest. It's not wrong to feel the way you do - the only
wrong thing would be not being honest with yourself and your partner.
Your want for no sex is not more valid than her want for it.