What kind of job u wanna to do ????

i really want to get a job in a call center but it really scares me im scared what if i cant answer the questions and all the what ifs,i really wanted to apply there because of the big salary but i dont know how to overcome my fear in interview im really scared during an interview i really got mental block and thats one of my problem why i cant apply as a call center agent because im scared i hope i can over it some day.:-(