Is this depression, please suggest me

i am 23,female,i just finished my graduation 6 months back. from childhood, i was in an environment where i was ridiculed and was criticized a lot among my relatives and community (cause i was a slow learner at lot of things). i started ignoring people and either used to hangout with my friends or used to be at home all alone,, after finishing my graduation i had to be at home and since my parents were gone out for tour for 2 months i had to live with those people i have being ignoring all my life,, as usual i had a miserable time.. now everything is normal,but i am not able to forget those comments.added to this i am being idle for past 6 months not able to decide what to do. these days i am just bursting out crying(i rarely cry before anyone) suddenly. i am not sleeping all night. feeling sad,unrest, scared,,not able to concentrate on studies.lost all my confidence.i am getting ill almost twice a week. my mind is filled with all those criticism i faced all my life.. and questions of what should i do.. my parents keep asking me about this behavior but i am scared to tell them too. i have never discussed about this with anyone..i am just sitting alone in a room crying all time,cursing myself and some times slightly hurting myself.there is a severe headache too..help me i wanna get out of this,,