what is the name of this problem/ symptom?!

It sounds like you have depression, I am currently struggling with depression myself and it is quite a difficult experience. Lonliness is a hard symptom to overcome, but there are people who care about you. Please do not hurt yourself, I have horribly ugly scars on my wrists that were self inflicted and I wish I could get rid of them. And please do not even consider suicide. I attempted that once and still remember my father's face as they hauled me to the emercency room and it hurts my heart everytime I see it in my mind. It hurts me to know that you are suffering even though I don't know you. I really wish the best for you and hope you can overcome this. Maybe you have a younger sibling? My little brother keeps me motivated to live life to the fullest for his sake because I know that he loves me and instead of living life to make me happy, I think about him first and it lets me feel better in knowing that I can help him and boosts my opinion of myself. If you do not have a younger sibling maybe you would be interested in doing some type of charity or maybe joining a club that interests you and you can meet other people that enjoy the same things you do. I really hope I helped, and if low self-esteem has any part in this, Just remember that everyone deserves to be loved and you absolutely are loved and will find happiness. You have so much potential and all you need to do is cultivate it and learn to love yourself. People are attracted to those with good opinions of themselves, so just remember that and that life is a series of ups and downs and when we are at our lowest, there is nowhere to go but up.

Depression with moderate to severe anxiety anxiety.

Sounds like depression to me. x