What would u do if a policeman gave you lecture over if you don't something with your life?

iam 18 years old and iam adult and i can do what every i want to. i need to follow my own path not nobody path. i plan on really to go to community college this fall and become a electronic tech-anion and hook up electronics DVDs and tvs etc. i just takin a year off because i been through a lot to graduate high school . i had to transfer from two high schools because me and my mother had promblems with living arrangement. and my mother was unstable in 2008 so i had to live with my grandmother for 2 years. when i graduate in 2010 my mother did not come to my graduation. i almost didn't graduate because of problems. and i had to do community service to graduate. my community was to fill the foot ball players water bottle. so the policeman doesn't know what i been through to get to this point. the reason why the policeman was because my grandmother was drunk and possibly drugs and call the police on me because she said i pusher down. i didn't pusher down . i was trying to moved her arm on the side of my room door so that i can close the door with out closing it on her arm. because she was lending on the left side of my room door yelling about did i know that me and mother had i paper saying that we moving in June.i did not know that me and my mother was moving June. i was confuse and did not know what to do. my grandmother was drunk and on drugs and acting crazy and yelling and arguing with my mother. she was yelling and arguing with her family members because they did not come over to her house for memorial day weekend. and she was mad at my mother because she thinks my mom torn me away from her. it used to be just my grandmother and me but now after 2 years my mother had came to live with us. i loved my grandmother but when she drinks she starts being mean and yelling at people and always want to start argument with so someone. she just can control herself when she drinks. my mother thinks she is taking pills (drugs). because she used to taking drugs when my mom was little. i love my grand mother but she say things and make comments that get on your nerves. that why i avoid her something is because she drinks and says stuff that get on your nerves. i just saying what i feel inside. i can't help what i feel inside. So what happen when she what lending on my side door i moved her arm so that i can close the door because i hate to see her drunk and acting crazy like this. then she i heard her fell down on the floor . i then open the door and i saw her laying on the floor said she is going call the police saying i pusher down. i didn't push her down she fell on purpose. she was drunk. you know when you drunk you can barely hold your self up and then you tumble a bit and fall down. i did not push her i just moved her arm so that i can close the door. then me and mother left the house and went for a walk for things to calm down. when we came back to the house we wait for the police to come. i can't believe she call the police on me. i didn't do nothing at all. i was siting peacefully in my room listen to my mp3 player bothering nobody and then i heard my grandmother and my mom arguing down stairs. my grandmother came to my room to bother to prove a point to my mother . she the one was drunk and came to my room to mess with me . i was in my room siting quiet by my self. iam a good person and a shy person and have ADHD. ADHD is attention deficit hyperactive disorder. it when you don't follow instructions or listen very well. i have a good clear record i don't do not drugs or nothing my grandmother is the one with the problem she is alcoholic. when the policeman came he told her to get some rest and some sleep. then when my grandmother introduce us to the policeman my grandmother told the police my dam business that i just graduate from high school a year ago. and when the policeman ask what i do and i was stuck in silence and did not know what to say. my mom told him that i taking a year off. and that what i doing and i can do what i want to do it's my life. and i told the cop that i going to community college this fall. and then he gave me that the lecture about if i dont' do something that iam going to be a hoodlum on the streets. and if i ever want to something from life you have to go get yourself. i told him i believe in my self. he shook my hand and my mother hand when he left. And when the policeman left my grandmother told me and my mother she sorry. And i told her i dont want to speak with u because i was still upset over the policeman intervene me like a was the one with the problem or something. i did nothing wrong. i never ever want this to happen. this wouldn't happen if my grandmother would of went sleep and got rest when she came from work. i know i need to find something to do but iam trying iam trying to get out of the house. that why i going to a community college to become a electronic Technion that hook up electronics DVDs and Television