I'm very upset because i learn that two of my دوستوں (before 2 years)with the other girls of my class(exept 1 of them)were gathering in one place and say bad words about me:-(...Bit 2 of theme are my friends....What i must do now??

Well, first I think they we just jealous because a boy liked آپ and not them, which is typical. Second, آپ have to talk to them face to face and ask why? آپ thought they were your دوستوں and how could they talk behind your back. Tell them how would they feel if they were in your shoes. Experience is what separates the situation, if they knew how آپ felt, things would be different. For me, the best way is to aproach them maria, but not disrespectful way, otherwise they'll keep talking trash. aproach them in a calm matter and ask for an explination, after all, آپ deserve one. I hope I've helped آپ sweetie! Take care and be strong!

آپ sould say they are hurting you. even know i would مککا, عجیب الخلقت em in the face and kick there asses

These type of things are daily in the "dear friendship."
If those were your friends,they wouldn't say bad things about you;they would have protected آپ and sayed to the other girls"shut up!don't say rude things about maria!She is our friend!".If they really would have been your BFs.
They are just jealous because the boy liked آپ and not them,which means they start hating آپ about that.It is typical this problem.
آپ shouldn't be with those kind of friends,you should leave them.If they are mean to you,why آپ should be دوستوں with them?You don't have to care about those b*tches anymore.You have to ignore them...
...Welcome to the کتیا, کتيا world!
آپ have to be strong,take دل and go آگے with yourself.
آپ can't let those poor(in the Bad way) immature fools to take آپ down.
There are so much مزید peoples that would love to have such a friend and will protect آپ always!Like me,for example.
This happens to me too,but without a reason for boy یا soemthing.They just hate me without reason.And they do gossip and other offensive things.WITHOUT ANY REASON!I'm just friendly,helpful to them and they keep saying for me rude things!
But anyway,we are talking about your problem now.
As I said,You should care about yourself,your school mood and all your favourite things.
No one can mess with Maria!

I hope I helped you.:-)
P.S:Not all the peoples have a dark and bad heart!But آپ just have to keep looking for some wonderful friends!

Did آپ try talking to them about it? I think thats the first step, people speed roumors to break up friendships like that.