YOU are not worthless! You are just in a time period where people aren't funding and focusing on supporting education as much as they should.
Focus on you and your passions! maybe this will be motivation to find a better job, or become self-employed, or go back to school, etc.
Here is a big hug from me---it can be so hard when things like this happen, but everything happens for a reason, as they say, and there is something better out there for you. Of course, you can't see it now because of all of the emotions involved, but later it will be more evident.
Be strong, make time for you, stock up on sugar-free treats so if the urge hits, etc.
((((hugs)))))