I think your feelings are totally natural and that maybe at your point in your journey your outer world has brought to you a kinda sneak preview of someone who is in a position that maybe you would like to be? She may be more of a social butterfly and has a lot of attributes you maybe see your self obtaining? I think you should definitely follow your heart and seek adventure but keep in mind real friends will always be there so you don’t have to worry about losing any while trying new things. Push yourself to be more outgoing, louder and open minded to new things. I believe that you can create a large network of great friends just like she has and there may come a time where you can even be honest about how you felt because guaranteed there was a time she felt the same as you while reaching for her goals!! 🙂