What's wrong with me?

I've been feeling very bad for 1 year, a year ago I was very happy, I often laughed with my friends, I was just the happiest person, but when I lost my friends, 2 months later after I lost them I lost then very bad, suffered a lot, but now i'm over it so our friendship but i'm still suffering? I'm only in my room on my mobile phone or laptop, I sleep and eat and don't do anything else I almost never leave my room because I prefer it to be outside I hate light / sun I hate when people talk to me I avoid contact with others People, I prefer to be alone, I don't want friends because I feel more comfortable alone, I push people away from me, I just don't feel like anything, I used to enjoy going out I loved the sun, I loved being with friends be, but everything has changed I like to be in the dark, I want to be left alone and I don't want to be happy I don't know why? I don't feel anything for other people, what is it all about me? I hope you can help me.

And I'm sorry about my German.

I have the same problem since the 2 lockdown, a lot has changed for me too I'm only alone in my room I only do homework, eat, look on my cell phone and I also have less contact with my friends and yes I hope all of that how it used to be and I wish you that everything will get better that you will be happier again