Hello TimTheEnchanter: Well... the Skeezyks has been married for... oh... over 35 years!

(My wife's accomplishment... not mine.)

The only thing I can say here is that, from my perspective, marital relationships change over time. Ours has. Sometimes couples manage to stay together for one reason or another. In other cases, they don't.
From what you wrote, it sounds as though your relationship with your spouse is becoming strained. No, I don't think you're making a mountain out of a molehill. It does sound as though your wife is feeling pretty negative about her relationship with you. And perhaps the possibility of divorce is in the back of her mind. I can certainly see how this would be disturbing to you, especially since you have no friends or relatives. I presume you're a bit older too.
I'm afraid the only suggestion I would have would be for you to consider taking a proactive approach here. Ask your wife, "point blank" what her intentions are. See if she would be willing to consider marriage counseling. Consider seeing a therapist yourself if you feel you need someone to talk this all through with. From my perspective, you might as well get out in front of this situation & figure out where it's going & what that means for you. Otherwise, should your wife in fact decide to call it quits at some point, you may simply be left scratching your head

& wondering what in the world to do. I wish you well...