BE HONEST IF YOU DON'T KNOW IT, DON'T BE AFRAID TO LOOK STUPID

Be honest if you don't know it, admit that you don't know anything about it because if you will pretend that you know something about it then you will be caught in the end, people will know that you're lying which is embarrassing even more. Admit it now, admit that you don't know anything about it. It's ok, it doesn't mean that you're stupid, it only means that you're not interested with it and you know something else that is related to your goal.  

It's ok if you get left behind on something, it's ok if you don't know too much, the most important thing is you are true to yourself and you're not a pretender. Being real is much much better than being fake. 

Never try to fit in because you are only disgracing yourself by doing that, you are only throwing away your power. You will only look stupid even more if you are pretending that you know something and people will find out in the end that you're ignorant about it.