I'm so tired of being a happy but I'm not okay, nothing its okay & I'm always scared...I deleted fb, I ignore my best friend & what's next? MY FAMILY?

My biggest fear, when I'm about to shut it all of my family, best friend & sister/brother out of my life. It's so hard when I'm think of them & their words came into my mind "why you feeling sad? why you did change time of studies? etc etc" Its makes me feel a worthless & I don't feel happy than I used to be happy since lonely without my closest cousin left me & gone to be married. I miss her & its soo hard. I've broken up my two previous bfs because I'm not interest in them & I get distract it. Part of my life feels empty & hurts like I'm falling on the ground & scream but I wanted to STOP from everything that I've been through crazy emotional & lonely.... I like switch off.
However, I never take smoke or drugs or sex or anything in my whole life. None of them isn't part of my life & I always know its not good.

Without help...I couldn't survive