Can’t orgasm 😪

So I was having sex last night and he was giving me head and it felt soo good at first, he was sucking and licking the right spot and then all of a sudden my clit started to feel EXTREMELY sensitive, to the point where I had to push him off of me to stop licking there because it was so sensitive that it started to feel uncomfortable. What does this mean? Does it mean I’m close to having an orgasm? I’ve never had one before so I don’t know how it feels. Even when I try playing with myself at home, I still get this same feeling. I just wanna cum and know what it feels like to finally have an orgasm😩any advice or thoughts would be appreciated.