i talk and laugh to myself loud, i look for a chance to be alone to do that.?

[RichDiamond]

it's embarrassing, i talk loud, i cry and become angry and i speak out everything imagining the person i am not happy with, i imagine the person is giving me answers and i am also trying to counter. i look for being alone, in the bathroom, kitchen, i talk just like some one is present who i am talking to, i continue conversation... but i don't see anyone i just imagine. i am now 30 and i had been doing it since my childhood. first time i did it when i was alone in the sitting room and i did not have anyone to play with. i imagined myself as a fairy tale character from the book, that's all i remember... but now i say things aloud i am not supposed to say and i realize that i have been talking for hours and i become tired. some people saw me and felt scared. now i am scared, it's not in my control... plzzzz help...