Am I a total loser and a hypocrite, should I just leave and put everyone out of their misery?

NO. Don't be ridiculous. You need time for YOU. Your family sounds like it could use a little family counseling too. Why not look into it? If you are so unhappy, how about a trip to the doctor's? Maybe an anti-depressant? What I'm saying is take matters into your own hands. Don't just run away from it all. Don't do anything rash. Decisions made like that are never good. Take one thing at a time and address it. Take one thing you can do to better things and apply it to your lives. Start there...one thing at a time. Get a therapist's help too!