Asexuality

I’m 18 and a while ago I was seriously questioning being asexual despite not having a “proper” reason to since I’d never kissed anyone let alone been with anyone. But recently I started up a relationship with my best friend, the first time we hooked up I felt like the asexual thing was one hundred percent confirmed but I’ve since come to think it was more that I’d hyped up kissing someone so much that the real thing just wasn’t really as I expected. She knew that I worried I was because I had spoken to her about it before anything happened between us because we were best friends after all and after being with her I’ve had to reassure her that I no longer think I am. I don’t necessarily think I am and I always thought that if I was I would be Grey-ace not full asexual. Anyway the reason I’m writing this is just that the more I’m with her and the more we experiment the more I feel like I’m not feeling things enough, she gets pretty turned on and will make noises and take breaths and stuff when I kiss her neck or other stuff but I never get that urge there’s nothing that happens that makes me think I would do anything like that involuntarily. I know some people aren’t vocal but it just feels like I’m not sure if I’m feeling arousal properly like I’m not sure if I’m feeling it more than just a very mild throbbing feeling occasionally and I always thought that arousal was the kind of thing you knew when you felt it. I’ve also gotten physically turned on as in getting wet but it never feels like my feelings are enough to warrant that and she’ll be out of breath and I’m just worried that I either think arousal is a lot more than it actually is or I have low sex drive or idk... it’s not like I don’t like anything but its more exciting to see her get excited than it is for me to actually be. I’m still young and I haven’t been with anyone else and I don’t know I’m just not sure what to think. Or what I could do to make anything better? I’m sorry I hope someone can help