How do you know your asexual?

I live in a world obsessed with couples dating, marriage, sex.

I am 35 years old, never been on a date, and never had a girlfriend.

I understand I am ugly, but I have never wanted to date men or women, it just never was a desire in me. But I still think about sex, mainly because its all over TV, and everyone in society talks about dating, marriage, and sex constantly, am I asexual?