Feeling down 😔 words of encouragement?

Earlier today, I surprised my SO with head, but I couldn't make him cum. This happens about 80% of the time. He says it isn't me, that it's his in his mind. However, the fact that I can't please him in this way often makes me feel pretty down, like I'm less of a woman, very unsexy, etc. I've been pretty sad all day since this happened.
I also deal with a lot of sexual insecurities. I feel like I'm not enough for him, not good enough for him, 
my body isn't good enough or doesn't feel good enough, or I can't please him.
I just want to feel sexy, desirable, womanly, feminine, like a sex goddess! What can I do?
Has anyone gone through anything similar or have words of encouragement?