I go solo to WDW (and on cruises) all the time and am 4 days away from my first solo trip to Disneyland (ok, pseudo-first trip...last time was early Sept 2011 so so much has changed, especially at DCA it feels like the first time - but first solo trip anyway). I have also done solo trips to Florence, Italy, Dublin, Ireland, and London, England. I LOVE traveling solo. I can do what I want for as long as I want or (in the case of theme parks) ride as many times as I want. If there's something I don't want to do or ride, I simply don't do or ride it. No one's food hang ups to deal with but my wheat and peanut allergies.
I have cruised with one friend, but we had a long discussion beforehand and made it clear that the nights where dinner was regular (we had one late night port where it was "just come to the dining room any time") we'd eat together; but other than that we could do what we wanted. Yes, several ports we chose to do the same excursions, but not all.
Solo travel rocks!!! Stop feeling sorry for yourself and give it a shot!!