I honestly do know how you feel, it's awful. I'm 17 and should be out partying and spending time with friends but I just dont do that. I find myself sitting in on a friday/saturday night watching whatever crap is on TV because I just dont see the appeal in going out. I used to love going out and like yourself used to be really sociable but the phobia has taken it's toll and actually rules my life now.
Like Cupcake said above, try and look into getting some therapy, do some research on which therapists in your area are the best ones & also maybe write a letter or call them or even look on websites to see which ones specialise in Emetophobia, if there are any. There is help out there, I know deep down this can be helped and with the correct help anyone can be on the right path to recovery.
PS - I just got my therapy date through today, so i'm really happy & looking forward now. That could be you