Wow, likewater could not have said it any better.

You are not doomed, though I can certainly relate to your frustrations on some level. Can you express this frustration to your wife? If not, why not try an online hook-up site? You can find women/men in your area and age range, I'm sure.... But whatever you do, stay optimistic. Please. And keep looking for a sex therapist; they can help you navigate through this.