First of all, i would say that this is a really good reputation! Especially if your friends are virgins. You are with your sexual experience somewhat like the tribal leader i guess.
Maybe you should strengthen your position as group leader and make all others really like you. Maybe she is just a little afraid because you are the grown up and experienced guy and she is the lamb...
I would try to really be kind to her when you are seperated now and then. Try small compliments but very unusual ones (never her lookds or something that makes her think "I bet he is saying this all the time to the naughty girls that have sex")
Usually i would suggest some cocky stuff in front of your group like "you all know how much she and I love each other, you feel the tension in the air right? Damn i love her passioned and expressive behavior" But i think if she is that shy and innocent it is too hard stuff for her and would make her sad....
Cheers
sky
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