Feeling lonely

Idk really. Just this feeling... its so nasty. Im just an avarage boy of 17 yo. Sometimes feeling of loneliness is overwhelming me, usually its goes away, but its always come back. I had a lot of friends in past but now i bearly chat with them. I watching how others are hanging out and having fun with friends, while I just spend my time at home. I have never smoked or get drunk in my entire life. I just need friend of my age to spend time with. Maby some of u had simmilar experience, how how did you cope with that? Or im just stupid exaggerating teenager