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Interviewing can be stressful and people often get really nervous. You just need to be confident in yourself and remember if the company didn't see something they liked in your resume then they wouldn't have asked you to come in for an in person interview. So congratulations you passes round one! Sitting face to face with someone in an interview can be scary and sometimes you can forget the words you had rehearsed. my best advice would be to not rehearse your answers, you should be answering them honestly and from personal experience so when practicing interviews just a few bullet points outlining how you would answer the question is best. Also its important in an interview not to use filler words when you get caught up such as "like" or "umm". Instead when you feel like you are starting to get off track just pause and collect your thoughts for a second and then pick back up.
I have this very same problem! No matter how much I prepare, I often have so many examples in my head that I end up rambling.
What I think both you and I need more is practice practice practice.
1st step--Google typical interview questions and choose stories that relate your experiences and show how your qualifications match up with the question. Stick with those stories as your "go to" and also think about other ways those same stories apply in other situations or differently worded questions.
Remember to try to use the STAR method---Situation, Task, Action, Result as a framework to formulate your practiced questions.
Next, practice with others and do as many mock interviews as you can. Your local job center should have mock interviews available. This way you are talking to real live hiring managers and can get your practice in. Also, try to go to one company job fairs. Even if your aren't interested in the job, you can get practice interviewing.
Having said all of that, remember to be flexible when using a story. If you recite memorized speeches, you will sound robotic and come of as disingenuous.
You should practice, practice, practice! It may seem silly, but role play with a friend or family member. Create mock interview situations with sample questions that you can practice answering on the spot. Reflect on your past interviews and instances when you sort of went "blank"; there may be a pattern. Are certain questions tripping you up? Feelings of anxiety and nervousness are quite normal in these situations; like in public speaking. The only way to get better at these things is to practice and get outside of your comfort zone. Eventually, it will come quite naturally because you will have experienced the circumstances before and be prepared to respond to the situation more confidently and competently. Good luck and do not give up.
Let me know what your area of specialization is and maybe I can help.
I would like to suggest you get more practice at interviewing. Reach out to friends and family and ask for volunteers to help you set up mock interviews. Treat the mock interviews just like real opportunities and prepare yourself just as you would for a real interview. Ask for specific feedback from your volunteers and put your ego aside when considering their feedback. With enough practice you will get comfortable with the process and going blank should be less of a problem.