I keep having angrey thoughts.. i need your help and advise..?

right, ok.. i have alot of problems at the moment, im disowned from family, my mum and dad dont care, they treat me like im 25, fair doo's im 17, 18 in 2 months, but i want to be treated like my age.. ive had an unsettled homless situation since i was 15, because i suffered domestic violence from my sister.. im sick of not havnt a settled home, my ex of 2 years is causing my stress, and i cant cry because of a mental block about because as a child, i was never alowed to cry, because i would have to look after my mentaly il mother, now, i keep having angrey thoughts.. as in,ill be in a cafe in town, and ill have thoughts of picking up the coffee, throwing at the wall, walking of whilst grabing my hair and then just running and not stopping.. i have violent thoughts towards close friends and there parents plus randomers.. what can i do and is this norma, to have alot of these thoughts on a daily basis? please please please can you help me? xx thank you