I do not have sufficient information to infer if you need to worry about VISA or not. If you have good financial aid, then you need not worry much about VISA. Generally Embassies will not cancel Visas for students with very good financial aid. In all cases, rather than worrying, invest your time in more productive tasks. Make sure you have all the necessary documents, make sure you know you have an answer to all the questions that the embassy officials might ask you. To learn about sample questions, see this: http://collegesodhpuch.com/home/question/what-kind-of-questions-will-you-asked-during-the-visa-interview-process/
To learn what documents you need to have, take the VISA quiz: http://collegesodhpuch.com/usvisa-quiz/
And Don’t worry at all. Worrying will not help you in any way.