It sounds like they are more extroverted, it's not about confidence. They may be confident in big crowds, but that's not what confidence is about. If you know what I'm saying. They may just be a little more lively than you are.
Do you want tips on being more confident or on being more like them?
To love is to suffer. To avoid suffering, one must not love; but then one suffers from not loving. Therefore, to love is to suffer, not to love is to suffer, to suffer is to suffer. To be happy is to love; to be happy then is to suffer, but suffering makes one unhappy; therefore to be unhappy one must love or love to suffer or suffer from too much happiness. I hope you're getting this down.