Anybody else hate this...?

Sounds like you're having a bit of trust issues. Why are feeling jealous about all this? Are you thinking that your friends are better than you, that there are other people out there more interesting? That's what it sounds like to me. I think you need to put a little more faith in yourself and your friends. There's nothing wrong with your friends making new friends, just like it'd be the same if YOU made new friends. You all chose each other for a reason!