My best friend has a new best friend and I'm being slowly forgotten.?

ok my supposedly best friend has started to hang out with this other guy whom i hate and I'm envious/jealous of because the guy has such a positive *** attitude and it gets on my ****** nerve. Never once have i seen him not mildly upset. to the point my bf is always with him whether it be spendin the night all the time at his place, goin somewhere cool, hangin out etc. i know i'm being childish and that all my time is not devoted to him its just bothersome. I have few friends and i'm socially akward around people i dont know so it's hard for me to make new friends. yeah my bf talks to me here and there and might if im lucky hang out, but when we do it seems like he is bored as hell. To make the matter worse everytime i talk to him he is always brings up that other guy name and it pisses me off. If he likes him so much he needs to STFU and hop on his *******. And to boot it turns out we all have the same lunch bell and the guy i hate sits right in front of me cause we both share a table with our classmate friends. My bf knows im mad and says that no homo i'll will always be his friend. Then one day like a little ***** I cussed him out. Yeah i know i sound like a whiny little ***** who needs to leave him alone. I've recently moved in a new neighborhood that i hate and i have no intentions of making new friends over here def not. Im cooped up in my home all alone by myself with my mean *** mother and sister. No father figure around and I feel really lonely. Little money we have so i dont have a hobbie. To the point i started writing and drawing, i've become lazy and depressed. Everytime i get mad at my bf like when i cussed him out he just laughs. lol idk at all but the other guy tried to be my friend but lets jus say i kinda snapped at him cause of my anger. So its a lost cause. please give me your feedback on this. I'm serious i'm very self conscious.