I am so happy you have those good things in life, and that is a great way to look at it. Focus on the good things you have, not the bad things you want to get rid of.
My advice would be that when you have those feelings that people are making fun of you, regardless if you are sure of it, or if it is just made up in your mind, say this, calmly to yourself:
"Where is the evidence that anyone is really thinking or saying bad things about me? Where is the proof that this is true?"
And,
"If people are making fun of me, or talking about me badly, without a justifiable reason, there must be something wrong with THEM, not me. Do they really have nothing better to do with their lives than sit around and talk about and judge other people?"
I personally like questioning my negative thoughts, it really helps me. But, we are all individual, so my advice would be to take those, and phrase them however you want to. Then, read them every single day, and in a week, i bet they will start popping into your head without even thinking about it, when you come into those bad situations.
Good luck!