Subjected to caught unlicensed dagger at home during investigation

Sir! I'm 15y/o and was unconsciously sleeping and during an investigation, police forcibly enter in my room, at the time of action nobody except was at the home, even my parents too. They're outside living right now. They started harassing me, slapped me and threated to ruin my further studies and life. Unfortunately! One of them had a glance of dagger kept in my house. He clicked my photo and even daggers too in their hands. What should I do in this situation? Because In this case there is a violation of civil and human rights by policemen and I have unlicensed dagger too. We both have broken the law. Further they forcibly take into the custody on the behalf of my father and at the time I had to complete my homework. I was there at the evening and were thrashing, threating by police to ruin my life in a single room. Any suggestions from you pupil. Because the steps have raised my police, has hurted my reputation in the society. Has anybody who can give legal advice to move on that one