Although each business school has its own culture and curriculum, all business students must nonetheless face certain similar obstacles. Your sentiments of vulnerability and anxiety are valid, and we don't aim to overwhelm or discourage you. But a lot of people feel the same way as you do. You're not working on this alone, in fact.
Strong academic performance in your previous coursework is a good sign that you can handle the demanding curriculum of an MBA program. Maintain a good GPA throughout your undergraduate career. An excellent strategy to distinguish yourself from other applicants is to list a competitive job or internship on your application. An additional excellent technique to demonstrate your abilities is to take on a challenging and fascinating position at work.