First of all, it REALLY doesnt matter where are you from! Most of people get the idea what your problem is and thats enough. If someone wont understand you right away, guess what? He will ask, you will answer. Problem solved. (it shouldnt be a problem at all
So about your problem. Like in most of the things (i see this all the time), you are what you think! We know more about sea, then we do about our brains, be we do know that if you keep saying things to yourself, eventually it will happen.
If you are really SURE that everyone is laughing at you, you will need to ask, at first ask your close friend, if he doesnt know the answer, ask a friend who you dont know so well, if he doesnt know the answer and you see casher at the mall trying to not laugh at you..say to yourself... EHH SCREW IT! and ask: Hey, am i having my zipper on my pants open or something??
You will see the reaction!
If you will still think, that people are trying to laugh at you, you need to start searching into yourself! I wont tell you get confidence, because this is not something you can just GET, or BUY,...you will need work to get there. But you can start. Start with first step, ask. In a funny way. If they really are your friends they will tell you what is soo funny.
In my opinnion, you've had a bad experience and its stuck in your head.
Believe me, I know some REALLY FUNNY PEOPLE (by how they look) REALLY
, but still, not everyone laughs at them. Dont worry we all have something funny...
You know what you can do? Each time, you will think that someone is laughing at you..try really hard to see something funny about him, his big nose, big ears (i am not saying this that you need to make fun of someone), i am saying this to you so you will see that this "FUNNY LOOK", we all have it, if you SEARCH IT.
Dont bother! Seek your own success and when you get it, WHO IS GOING TO LAUGH THEN?! Thats wright!
Remember: "In a world where you can be anything... be yourself."
All the best!