What could be the cause of lack of orgasm?

Hello, I'm 24 years old. She has been intercourse with her first and only sexual partner for a year. Before, I had one boy who sometimes masturbated my hand, although it never ended in an orgas, just a pleasant feeling. With the current partner we have been intercourse for a year, we use different sexual positions, we change the penetration rate, we use even different condoms, such as striated, with tabs, with lubricating, while I still do not have an orgasm. I would add that I have never had an orgasm in my life, and my current partner is my first sexual partner. In addition, I do not achieve orgasm or clitoris or vavature, either during masturbation or during sex. What could be the cause of lack of orgasm? I would add that as a child I was treated for hypothyroidism, and this supposedly has some connection. Now I do not treat anymore, but maybe this disease has renewed. I even bought iodine in tablets to deliver this element to the body, although so far I still do not have an orgasm. I don't know what the problem is. Where to go with such a problem? The gynecologist said that when it comes to anatomy, it's all right. Please help and advice.