and again I'm lost...

What's has gotten into me nowadays, I can't think straight and i felt beaten up cause now I realize am not good enough. I never really compare my life with others cause if I wanna be happy I could never compare. I will never let anyone say I am useless. and never have anyone has ever said that to me but recently someone did and I felt extremely down. If that someone doesn't mean anything to me that's fine but in fact that someone is matter. But it's obvious I cant do anything cause the sign of "taken" is clear and I'm not blind. and again I don't wanna steal that's why I am reckless. I am gonna leave anyway, but it has been great like literally.