Unable to have orgasm with husband

I have never had an orgasm with anyone. I only know how to get myself off when I’m alone and using a sex toy. I feel so bad because my husband will go down on me for a very long time and still nothing will happen. I don’t know what’s wrong with me? Is it because I’m not comfortable with my body? Or could it be that my husband isn’t a good sexual partner? Another factor is that I am on antidepressants and I heard that it can lower someone’s sex drive. I lost my virginity while on antidepressants and I don’t even remember the last time I was genuinely horny. Either way I’m so frustrated.