How does Orgasm Happen?

Hello Ladies, I'm 23, Married. Had sex before with my ex boyfriends but I don't think I've ever had orgasm. I had to learn about it when I got married because he kept asking me if I came after sex. I read a lot of articles about it, I even started doing some sex tips I learned on the internet and all but never have. Obviously I don't want to tell him that I've been pretending all these years(5) and I'm hella horny all the time.

I just concluded that maybe I'm never satisfied (in sex) and I should just give up on wanting an orgasm.

However, I still wanna know how do you know you have an orgasm. It's manifestation...