Wear your stripes with pride. You know you are doing your best. Don't make it worse on yourself. Relieve others of sadness and loneliness. They'll remember you, and karma will help you. It's not a requirement to be lonely if you do this, but if that happens, so be it. I'd rather be lonely and remember who I helped than surrounded by people who don't give a crap about me
Stop saying yes to everything and everyone. Stop agreeing with people just so you don't upset them. You're not a pushover. You were not put on this Earth to be stressed and miserable so others can be relaxed and happy (at your expense). Start protecting your time and your happiness. If others can't handle it, show them the door. Kick them out of your life and don't look back.