I regularly jack off, maybe 1-3 times a week, and I frequently

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I regularly jack off, maybe 1-3 times a week, and I frequently feel like I want to do it with her, I find her very attractive. I initiate much of the time (we live separate). Once we get going, however, I get bored within 5 minutes and just want it to end so we can get to the post sex cuddling. Right now, due to business, we get to it maybe once a week, but she would definitely like more. I can't bring myself to enjoy it physically and barely mentally -- I have never cum during sex with her, but I never have trouble getting hard (though after about 10-15 minutes I have trouble staying hard). I have a bit of a narrow fetish as well. As in, I can't get off to anything else when masturbating. Vanilla porn doesn't arouse me at all. We have tried many things but I just don't function like most males my age do I guess. I also did not start masturbating until I was 18 -- she suggested I try it.
I love her and she loves me, but I feel like I'm shorting her and she's sometimes forcing me into it and compromising like this will not end well for either of us. We have discussed this before and it may be reaching a breaking point. Do I have a problem? What should I do?