I was in the same boat for almost 1 year and honestly been rejected more than 20 times. My situation was desperate because I wanted to reunite with my family by getting a job in the city where my family lives so had no option other than keep trying. Finally got the job after an year. During that time frame I had similar feelings like yours. I blogged about it on Quora and other places but nothing actually helped because I like what I do but interviews are just different entity all together. My take away from that experience is that the process is not going to change so keep trying until you get it, quitting is not an option.