The first and formost thing you need to do is set all four of you down and discuss what is bothering you. i have been there. When our quad started, we had no idea what we were in store for. We have spent a lot of time talking and getting through situations just like this. Be honest and don't hold anything back. This can not work unless you communicate how you are feeling with everyone. Maybe you jumped to soon into the four of you being together at once. Take your time and talk.