Immigration coming into the USA

Immigration coming into the USA Hi guys, in a month and a half I will be going to the US to visit my girlfriend who is on exchange there and she told me that upon entering the US, an immigration officer will ask you a few questions about your reason of visiting, where you will be staying, etc. I am honestly already terrified at the thought of this “interview” and was wondering if any of you guys had some experience with answering the questions already. I’m scared that they will think I’m nervous or have something to hide if I stutter too much. Any tips from people who already went through this would really be appreciated!