Congratulations! Sounds like you're doing better than my first week when all I ate was bananas and almonds because I didn't know what else to eat!
It's really up to you about when you want to tell your family. You could even wait until you go back home if you want. Do you think they'll be supportive?
I'm assuming you're from Omaha by what's under your avatar. Check out happycow.com and look for Omaha and you'll be pleasantly surprised by how many veggie-friendly choices you have there. You can probably find the city you're in now (they have international listings) and see what type of stores and restaurants are available for vegans.
Congrats again and good luck. There are a lot of vegans on the board, so feel free to ask a lot of questions!