how to stop being so scared of interviews??

So my fear is interviews,, i only been to one interview and i got the job but it wasnt an interview more like talking about my life.... I got a call for a interview and im having a nervous breakdown lol Whenever they say a question to me , i completely blank out and speechless because i want it to go well... im thinking so hard to go well... Its sucks when you cant find the right answer in ur head😫 im studying right now of the interview questions but dang i already feel brainlesss lol... How can i speak up and say it calmly an answer without no hesitation?? Like the big question everyone asks is always TELL ME ABOUT YOURSELF, im like okay first im feeling nervous i might take a shit in this chair lol 😂😂😂