When you advise them or give the solution of the problem they feel small in front of you.
They do it b/c of jealously.
What you do stop advising them at all.
If they ask you just say I am also a girl like you, I do not know the answer then note their reaction and tell me.
Try to behave nice with them otherwise
Read Sura Maoozatan daily after Fajr prayer. (Last 2 sura in Quran-e-Pak) so that you should be saved from the jealousy.