not sure about life

So for the past few weeks i'm not sure if i'm happy, depressed, sad, angry....i just dont know anymore. I miss my sisters soooo much and i really want to see them. I know when i'm at school i act happy and everything, i just dont want to bother my friends with my stupid emotions that i can't control. they have enough to worry about with their own lives that they dont need my problems on top of it. I cry when i get home and i usually cry myself to sleep. and half the time i dont even know why i cry, i just do. half my problem is that i think to much, i always worry about things that i know i shouldn't worry about. i dont know whats wrong with me i just wish i could be happy so people will stop asking me if i'm ok. but i dont know what to do anymore...