Camarogodes--
Just remember that famous Shakespeare saying - "To Thine Own Self Be True". You'll find that when you go to the right house, you'll feel completely comfortable and being shy won't even be a consideration
I had a friend who was really shy, and when she went through rush, she was really nervous until she went to the house she eventually pledged and became a sister. One of her sisters told me she was chatting away like an old friend with them! So remember, be yourself!