Some of my students tell me that they are afraid of becoming vegan because they'll lose their friends. But I've found that I've made new friends who are super awesome - just like Nicole Elizabeth who I met earlier this year in a vegan cafe in Chiang Mai!
Vegan since 2006 (wahhhhhhh!!), she has a really comprehensive website about vegan food, vegan travel, vegan recipes - check it out at Vegan Nom Noms.
You'll never be lonely being vegan - you'll find that you're part of a vegan family instead :)