Oh no that is a sad story. I'm sorry. I can relate my rents were separated at my birth then I didn't have a social life. Then when I was 14 I got treated for depression. But I was the same, crying all the time. I really hope you find solace in something. I was in the hospital for eight months with trauma from my adolescence. So there's a few things you can do.
1) Join a group to help build your confidence, like Toastmasters.
2) Go to a Christian Youth Group at a church
3) Be admitted into hospital.
4) Cram knowledge from self-help books
5) See a psychiatrist and tell the doctor that you have psychotic arguments. I've been there and it helped the most getting prescribed Zeldox. I am calm now. I also take an anti-depressant too.
6) Call the local distress center that is available 24 hours there is also a nation wide distress center.
You could have bipolar which would explain the arguments, that is my diagnoses. I get manic and sad.
I wish you many blessings. Keep your love in your life you need the support of your loved ones even if it is difficult. It is good you are at home with mom, I am too. Perhaps when you are ready you and your bo can move out. Exercise is good too. As soon as I was feeling up to it I do it to get fit. It's important for your loved ones to show compassion because depression is an illness.
Remember: You are NOT your illness
however there is still hope because mood disorders CAN BE TREATED!!!
Feel free to share this with your loved ones.
All the best!