I have been studying interior design for few months but I always stuck at the concept part, my tutor said,."its not a concept by placing an object or existing space to the space you are designing for". Im frustrated at this stage again.

Can you suggest me a website or what ever ways to create my own concept more efficient?

Is your tutor Yoda?

your tutor sounds like a douche tbh

very, but he teaches nothing ....

His concept in design could mean anything

Would you critic a concept design if you were not a design concept?

OMG, thats very true

Concept is the idea/plan behind a design. Design is implementing the concept.

In other words, a "design" could be random or copied but there was no idea/purpose behind it.