Making out and I think he has a boner

So basically when me and my boyfriend make out I think I can feel him get hard like against my leg and I’ve never made out with anyone else and I’m a virgin so I’m not sure if that’s normal or if that’s even what I’m feeling. Like I feel like I should stop kissing him when I feel it because I’m not ready to have sex so I feel bad if like he’s getting hard. I don’t know maybe I’m overthinking it any advice would be appreciated