If your all good mates, then slap them into order!!
Twisted was formed because we were all best mates, and we did everything together prior to paintball.
When we first started no-one wanted to play back, so we started off and we had no back players!! Big deal? You learn aggression, without aggression you wouldnt go anywhere fast.
You should be able to be honest with your friends, and tell them to train - or they will not see the benefits of winning.
Training and drilling is great when you realise how much you improve, and sooner or later your captain should be honsetly explain why certain people suit certain positions.
Explain to them how pissed your getting, and see what they want from paintball (wether its to play a tourney, for a laugh, or to be the best)
Good luck.
Auntie Rob