Peer pressure, and cosplay?

ok so my friends are going to the mall today. well they are wanting to go all out cosplay at the mall, and they want me to do it. ive never dressed up before, and i mean if people at school saw me dress like that, i would probably be laughed at. i mena no offense to anyone, but i mean you usually dont o thigns like that, like i wouldnt go to the gym in my cosplay outfit. i mean should i do it, cause i mean we will be the only ones doing it there is no con or anything just them wanting to dress up. so hsould i do it or what?