i need visa for travelling in Mexico ?I'm from Romania?

yeah you need a visa to travel anywhere outta Romania

Listen, you probably do not need visa anymore since Roumania is a member of E.U. and none of E.U. countries need visa to enter Mexico for up to a 3 months

You don't need a visa if you're traveling for tourism (according to the site of Mexican embassy in Romania).

Nu, incepand cu 1 martie 2007 Mexicul a ridicat vizele pentru cetatenii romani. Eu am fost in aceasta vara, trei saptamani, in Mexic si nu a fost nevoie de nici un fel de viza. Drum bun !

hallo,
yes, you need to apply for visa.
see the requirements here
http://mexico.visahq.com/requirements/Romania