There is nothing to worry about. Since these people do not want to talk to you, you should also ignore them as much as you can and find other friends. Do not give them too much attention, as this will make them feel superior.
Either ignore them like you don't care and find some better friends or you can go up them and say "look, I know you guys are ignoring me and it's not cool... So either be my friends or just never talk to me again."