There are definitely stereotypes especially around men always being horny 24/7 and how there's something wrong with them if they don't want sex. Something that stuck in my head is at uni there was this big girl tryna force herself on me when I was drunk and kept telling her to get off. I eventually got her away from me and locked my door which she spent a good 30 minutes banging on before giving up. Next morning my flatmates (male and female) asked me why I didn't just bang her. Imagine if the genders were reversed in that situation, ridiculous.
Anyway, attempted rape aside...
I'm curious OP have you always been like this, even when you're 100% sober, and are you otherwise healthy mentally and physically? If so you could be one of those rare asexual people.
If you're happy like that and it doesn't disrupt other parts of your life I wouldn't worry too much. If you are concerned you can speak to a doctor to see if it is actually something physical like testosterone or whatever. Can't really make a diagnosis through the internet. But usually that kind of thing happens gradually as you get older, so if that's how you've always been, it could just be how you are.