I have no idea which NPC group you joined but just remember that the makeup of a chapter can change with a pledge class or 2. Those who were once mean and at the bottom can change and be extremely close and number one.
Talk to your pledge class members and see if they feel the same...and do something about it!!
If you truly don't think it is for you, then perhaps disaffliation may be better...but remember the NPC org is made up of more than just those members. While I may not have instantly loved some of my collegiate chapter sisters, I haven't found an alumne athat I didn't like/love.
