What does islam say about loneliness ?

Assalam alikoum. I am a young Man. For the last 5 years i have been almost totaly lonely. 90% of the interactions i had were with my close family. I though I had made close friendships but i realised we were not that close, now I rarely see them though we still like each other. I have done nothing wrong, have always been good to every friend i made and they will testify to it. I am feeling increasingly lonely + struggles of life. I can't get married yet though I want to. Does islam, quran, suna, montion anything about this. Barak allah fikm