Yes, well, having a thicker skin is certainly MUCH harder to do in real life when someone is saying or doing hurtful, malicious things to you. That's for sure. But, I dunno... I think that you ARE going to feel hurt... initially. But, well, sometimes I think it takes a little while, but you need to just sit yourself down and have a long, honest talk with yourself about how distorted you're thinking... SURE people say really STUPID, ridiculous things sometimes! But, they CAN'T be talking about YOU! That's because YOU aren't the person they're describing. They MUST BE terribly misguided and mistaken!
Look, even if you ARE a "fat, smelly, middle-aged basement dweller", what makes that a BAD thing??? Honestly, how you look doesn't make one little bit of difference. What's in your heart? Who are you REALLY? THAT is what's important. Your outward appearance is of no concern unless you want it to be.
My goodness. You don't have to explain yourself to ANYBODY! Not HERE, not at home, not at work... not anywhere. (That sounds like it should be in a Dr. Suess book somewhere! )

Anyway, I'm carrying on too much here as usual.

I guess I just wanted you to know that, well, to quote the poet William Ernest Henley:

I am the master of my fate.
I am the captain of my soul.

No one can take that away from you if you sincerely believe it's true.

Dan