Why wasn't your GFT going well? I dont understand your instructors attitude, if he had little confidence in you he shouldnt have sent you on test! For him to suggest that you are not cut-out for flying is a probably more a reflection of his poor level of instructing
Are you sure you havnt misunderstood him? If not, then I recommend you should find a new instructor or even a new school!
Don't give up with flying, you'll regret it later!
2WINGS