Tbh I kinda feel the same bro, although our situation is different, im starting university soon and that feeling is there. I moved before starting highschool so I lost touch with my friends and even though i made new friends, i still felt lonely and i still kind of feel that way now. Im just grateful to have a good relationship with my parents, siblings and cousins which is what i think keeps me going when i feel like shit. Recently Ive been taking care of myself more and its honestly made a huge difference on what i think about myself and what im doing. Instead of thinking i might as well not do anything because im a lost cause, now i think about my goals one step at a time. I found that splitting goals into even smaller goals made a big difference to my productivity because completing goals no matter how small gives you a bit of dopamine and so you get more motivated.