Having a visa does not guarantee admission into the US; in reality, the visa only acts as a permission slip for you to arrive at the port of entry. The next part, which includes your interview with a CBP officer, will determine whether or not you will be allowed in. The final decision is always in the hands of the CBP officer at the POE you make it to. We have detailed the steps involved in entering the USA on your F1 Visa in this video