My Social Media friend

I don't know if it's readable when I write this, so I apologize to all of you because I'm a very beginner in English and I'm using Google Translate and I have a question. My friends keep leaving me with ridiculous excuses and it's like being stabbed by a thousand knives and I don't understand why. I don't know most of them in real life and they're just my virtual friends, but I'm attached to them because in reality I only have six or seven friends. It's kind of hard when I lose someone. I don't know why, but when this happens, my depression starts to rise and it makes me more and more depressed day by day. I just need some advice. If anyone is reading this, does anyone know what I should do? I feel so much self-loathing.