Not able to clear a single interview

Hey! I'm not able to clear a single interview every time before interview I get nervous and get blank . I always know the thing but I'm not able to make understand my point of view have given more than 10 interviews not able to clear a single one, can somebody help me out with tips . Sometimes I feel like jobs are not for me I should do some other work which includes less interaction. Or my destiny is taking me either way