I'm sad.. help

I'm so fucking sad. I feel alone, I'm not alone tough, don't have many friends but have 3 close ones, my family are here too. But they just don't understand me, they aren't bad, things just seem so simple for them. Everything I do fails, nothing goes well. Nothing makes me happy nowadays. Even coming here is just from habit, I just scrolls down the mangas without reading. I'm tired, I want to cry but it doesn't come out. It's like I can't allowed myself to cry but why..? I feel this sharped pain in my chest all days long, my throat squeezes in the morning when I wake up, before sleeping I feel lonely and cold.. Do you have a cure for me ?