Yeah I met my boyfriends parents and I was so nervous like hell I felt so ill and my anxiety levels were through the roof and I don't have anxiety! Just remember if you make your gf happy, they will most probably be happy with you, all they want to do is meet you and get to know you! You will feel nervous but after you'll wonder what all the fuss was about! Good luck not that you need it, nothing bad will happen! The worst is you'll stutter abit and they'll think "oh yes that's his stutter" and that's it! :)