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Thank you for the reply, but I still haven't fixed it. Maybe I'm moron a little, but I've no clue on how to fix this. I've started again from y and smooth rod installation, cheched everything, tightned all bolts and so on... If i move y carriage manually, the belt goes out, I printed a 2 layers square and the printer worked. I'm gonna check it with a longer print tomorrow.
I also noticed that the belt ins't perfeclty a stright line, I think it needs to be higher on the motor and lower on the bearing... I'm so confused!
Thank you for any idea that you can give me

EDIT: I've just discovered this, maybe I can try it https://www.thingiverse.com/thing:1032224/#files

2.5 ToyRep pulley for Y axis
by sobo84