Nah, Girl, you are neither aromantic nor asexual. What you are has a name, and it's called a late bloomer.
Actually, this is exactly why you shouldn't try to diagnose yourself, but rather let a doctor/specialist do it. Because be it medicine or psychology, most people will get it wrong. Also asexual people are rare. Most people have some kind of sex drive, sometimes weak, sometimes suppressed, but nothing at all is just very rare. Thinking that you are asexual, without even trying to date is... well you're likely mistaken.