I get upset to easily and it makes me an angry freak, i feel sad and stupid, how to change??

Hello, right now I feel a little messed up. I was studyin at a room at home and my sis came and sitted to read a while but i asked her to leave because it bothered me her prescense and the act that she opened the cutains, and i din't like so much the light. i know i sound silly or plain stupid (sorry for the word ) but it made me way too angry and i started yelling at her to which she yelled at me and then she didn't leave the room which made me upset adnmy mom came and was inthe middle of the argument. So tried to moved her books and became upset and then she hit me and and try to puch her out of the room but i can't so i moved her stuff agin and she hit it me agian. and we were like that for a while but she wouldn't leave the room and i was way too upset and i feel way too angry to stop then i call her horrible stuff and she hit me and so on a couple of times more and i am still very angry and it always happens like that; i amkes me feel as if ia m quie t sorry the word f*cked up n my head because i get too angry for small stuff and always with her because when we are fighting she always wins and i hate that. my mom supports her decision but not mine and now she says that i f*ucke it up and maybe it's true bu i still feelrage for her and i feel dumb too because i feel st*pid because i always want her do something(ex: leavin the room i am in) and then we end up fighting and she wins and they say i am inmature for makin such a big dela of it and i guess they are right but i feeltons of rag towards her when she doesn't do what i tell her, i feel so impotent and frustated she doesn't do as said and then she hitsme more han i can hit her. and i am upset ad i puch the walls and it hurts but i feel so upset, i feel as ifi am too f*vked that nobody will like me so i'd like to change that but i still feel so much rage, i should go to a psycologyst but we don't have money to go to that. Maybe you could help me. I mean i know that i need to change my personality, i get too upset to quickly but i hate that she always "wins " the fights and kicks my ass. Damn it she never respects me.Why can't i win one and be a normal person. I must sound likea freak because of huittib walls and gettin so angry for sthg simple. do i have sthg am i a mess i think so how can i vecome someone more normal that people will kike more, i feel so idi*t because it might be my fault that i started the fight, i could'nt win and then i am still upset while she doen't even care, that buggs me.
Please if you could give me your thoughts on that it would be awesome, i wanna be normla nd not behave and feel like afreak. i am a girl btw, 18 years old. My family is broke and we can't afford a psycologyst and i live in Peru so there aren't free psycologyst.
Please help me i have always wanted to fix my personality i know i have to do it myself but i feel so messed up i don't kno where to start i don't want to be a joke.
Thanks
Valeria