Why can't I lose this weight and become thin and healthy

Why can't I lose this weight and become thin and healthy?

I don't know. I have been thinking about this dn I think all these people around me are losing, why can't I. What is it that they have that I don't. I am asking myself am I meant to be like this, overweight and unhealthy. Will I ever see my goal weight when all I can see is myself getting farther and farther from it. I am just so frustrated and pissed at myself for being like this.