So i told lydia to wait for me.. Fast travled and thne i forgot where she is xD.. I found the place where i left her and she is not there anymore.. It's really near to an city so i guess she couldn't die.. Where can i find her? did she go some[censored] special..-.-" Soo thanks

Check Dragonreach in Whiterun OR Breezehome (only if you bought the house in Whiterun)

I always find her in Dragonreach eating at one of the large tables, but that was before I bought breezehome, so she might appear there. This was really annoying for a while so good luck!!