How can I get him to stop pretending?

I have friend who is a wanna be on everything! He's a wanna be skinny person (he's big boned so even if he lost the extra 50 pounds he would still look fat) he's a wanna be hipster/scene he's a wanna be fashion expert (he has horrible fashion sense) and worse of all he's a wanna be gay... And he is the biggest attention hog ever! He will steal peoples ideas, stories, and spot light. He will steal stories you just told! And make it seem like there his, he will do the same with ideas. He is so nasty and judgmental he is a huge lier to. How do I get him to stop being such a wanna be/ lieing/loser?