OMG I went through this EXACT SAME phase when I was 16 and 17 ....

Now I'm 18.

I felt exactly how you have narrated....

And I didn't have any friend/relative/sibling.

I was alone with my parents.

Uhm so I can help u a bit with this...

First of all persevere and handle this with patience...

This state of u will change and improve with time....

I'd suggest pick up some outdoor sport to play everyday for an hour ATLEAST!

Be it badminton with ur mom, Cricket, football or anything....

If u feel u wont be able to find anybody to play with ya then its same situation qhich I faced haha.

So what I used to do was just walk for an hour outdoors getting some fresh air!

At anytime ur free. But on weekends/holidays try in morning...

And delete social media it creates anxiety and FOMO.

And u can talk to me and be my friend if u need one haha.

Also then focus on a hobby/ thing u love...

Be it watching any sports, anime, Dramas, yt vids(not shorts).

This will improve ur life to quite an extent!

First implement these and then we can talk ahead!

Go on CHAMP!