Boyfriend's father..?

Okay so I need help. My boyfriend and I have been dating for almost 2 years and I've only really "met" his father a few times and even those idk if I'd really count..the reason being because during that time, I had a ton of family issues myself that I had to deal with. But now its seeming more and more like it needs to be done. Put simply, I'm scared out of my mind. He's a very intimidating man, and as I have anxiety as it is, I'm not sure how to impress him as last time I literally could not get any words out. Any tips or advice..? I have absolutely no idea what I am doing here 😔