What a tough and difficult situation to be in!
Raies already gave great advice!
Your parents are both grown-ups (although apparently currently not behaving that way!), so it's not your fault and not your job to fix their problems!
Stay out of arguments as good as you can manage in your current situation!
Keep taking good care of yourself!
You can be so proud of yourself!
Maybe there are self-help groups in your area that offer support to kids in disfunctional families!?
Do never feel ashamed because of your situation!
Couples sometimes get into this mess despite their social status, education etc.
Hope, you manage to get some sort of support somehow!