Yes it's hard to tell you, buy my sister did the same, and she's a spoilt girl lol !
And finally she was in the same situation because her "boyfriend" (she's 15) dumped her, she was depressed.
Sometimes, I don't want to talk to anyone, even to my girlfriend or you are quickly upset, you are touchy thing like me, one thing can upset you for nothing at all. But you can be friendly and stuff....you can't stand any wrong notes !
Or it's your character or it's just a moment in your life, it will go better for sure.