can't study

Tbh I still don't understand why I'm feeling this way is it the way I was since I was a kid or suddenly got depressed and now I can't even study as I used to I literally changed I can't even stay 2 hours studying I'm always on my bed and my phone and I feel tired and negative even though I always try to get better with any kind of way I tried praying cleaning my space thinking positivity but I always fail and I always seek attention from others and most of times now I'm alone I have friends but not really my friends everyone is busy with their lives even though we're just 18 I am so tired and my mental health is getting worse and I have I should study or else I will fail like last year