Went veggie at 21, though I started the process earlier, dropping certain things when I really thought about what they were (veal, for instance, lamb chops too), then at 20 I had to drop cow, then the next summer I dropped it all.
Only thing I've ever missed was salami, and that's while pregnant, and I hadn't actually eaten it since I was 11. I've given myself permission to eat salami while pregnant in the future, as I had so many food aversions that to WANT to eat something was an amazing gift that I should have just taken, but apart from hot dogs that's pretty much one of the grossest things I could possibly miss, IMO.
Well, officially I still allow the occasional order of fish and chips, but I think the last time I had any was at least a year ago...it just makes me feel SO sick, and doesn't fit my normal (not while pregnant) criterion of "if I could take whatever live beastie this came from and MAKE whatever I'm going to eat from start to finish, I'll eat it", since I highly doubt I could ever go fishing again, it's best that I drop it entirely from my possibilities.