Is Depression even real?

Does Male Mental health matter ?
I understand the point of feeling depressed but i dont understand the point of it being a desease that people have to cure with medicine. A lot of young males suffer from depression because they feel lonely. Being lonely can help sometimes. Feeling lonely can tear you appart. Lately im no longer feeling like shit because i met someone who shows me how great im actually doing, shouldnt everyone get the opportunity of feeling more important ? Behind every happy guy who wants to spent their time with their partner  is a little insecure kid who ate by himself, sat by himself, cried to himself, laughed with himself and talked to himself.