That’s good. You can only improve yourself. You can’t change her.
That sounds like projection and that’s part and parcel of why I suggested you focus on you. You feel bad about yourself, you have intimacy struggles… so you assume she’s not attracted to you. Because you’re not attracted to you! You say to yourself “I don’t have a good job, I’m out of shape, our sex life is lousy… my wife must not love me or be attracted to me.” It’s a logical conclusion, yes? But it’s projection because you have no idea what she actually thinks.
None of us really know what another person thinks. We can only glean ideas or make assumptions.
So yes, make that therapy appointment. Keep your chin up about the job hunt. Get in the gym more. Be a better father (I’m not saying you’re not good, I’m saying we can always do better). Even if you encounter setbacks on the job front, develop your skills across the board. Take up a new and cheap hobby. Do some free online coursework or train yourself to do new things. It will keep you busy and it you will be accomplishing something. That’s important stuff and it will bolster your feeling of self worth.
And brother, we might not all have the same struggles, but we’ve all been there in terms of feeling lousy about ourselves. Remember that you are a child of God and He loves you just as much as everyone else. The richest guy in the world, the poorest guy in the world, the nicest guy, the meanest… all of us are equally loved by the Lord.