Feeling down and depressed

I am a 16 years old, tomorrow is my birthday, so yea i am young and i have no energy. At this age i should be doing miracles! I should be working for my goals everyday, putting all my energy into it, into my studies, i have a family to take care of(my parents). But in my case i am not. I have very low energy and i feel overwhelmed. I don't know why this is happening. Also my connection with Allah, feels over.

A few years ago, i was feeling amazing. I was very confident, with positive thoughts, doing progress everyday, connecting with more people, having lots of success, and living my best life! Until it started to go down and down. The feelings was dissapearing. You know at that time, i had very strong and belief in Allah. Even tho i wasn't praying often(because of time), i had the belief and faith, and i would live everyday with that faith. But i also have bad habits(social media addiction, music addiction and 18+ adult films addiction). And now, the inner belief is all gone. The confidence is gone, i have mental health issues and sleep deprivation. And i have no more left in heart, i don't feel my heart. Allah is all gone from my heart. And i lost the motivation to do my goals. And my grades are also slipping.

I don't know what to do. I want to start and connect with Allah, i pray and make dua as much as i can, but i don't have that connection i had before. Its gone.