How do you feel if somebody steals your show?

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How do you feel if you introduce a new fish to your freinds circle and only to find that he/she gets more attention than you? Look, many of my freinds envy my job because I am the only girl in the office. My collegues treat me like a little sister.But I am kind of shy and do not take this advantage. Actually most of the time it is me who is taking care of them.So in their eyes I am much of an independent girl. Then the other day I bring my best girl freind(who has almost the same personality as me, I believe) when I hang out with my collegues. Out of my expectation, the girl is very active. Soon, she is able to talk with my collegues like an old freind. After a few days, I find the girl keep in contact with some of my collegues without letting me know. I don'know if I am jealous or what, but I am not very happy about two things: 1.I think the girl is a little more enthusiastic, which is not how I know she is 2.I think she should at least let me know if she has contact with my collegues, after all, it is me who introduces them.I deserve to know, but she is hiding from me. Besides, we almost share everything. These questions have been bothering me for days. I don't know if it is my selfishness to blame or she doesn't do the proper thing. If you were me, what will you do? I start to feel less confident in front of my collegues...