Two is company & 3 are crowd.
Do not trust every body and never tell tem your personal things. Select one or two but first pray to Allah that he should award you with good friend. Hazrat Ali RA said who has no friend he is poor.
Make always good friend because later on you follow her. If she is good she will tell you good things but if it is other wise then.
So take time & study. The girl who is good in study try to make her friend.