Feeling of frustration and loss of enthusiasm

I tried to improve my skills in my fiedld "architecture", so I participated in a competition with my professor and a colleadue, but this colleague found some solutions for the design that made the outlines of the main design, and for me I tried to think and search but I couldn't discover anything, and now I feel that I have nothing to do because I didn't find the main idea of the design. In addition the professor is my crush, so it's worse for me. I feel the my mind is empty and I have no imagination.