Sex Is Dead

So my fiancee gets upset whenever I dont want to engage in sexual intercourse so much so that he even turns away from me in bed and have an attitude towards me. But he also makes fun of me for not knowing how to do certain things in bed and it makes me too insecure. I've looked up everything including watch porn to see how things go but once i try it i fail and once again he makes jokes about it. Well I give up trying to please him. He wants sex but im too scared now because I dont want him to keep thinking "here we go again" but he also gets mad when I turn him away. So to me SEX IS DEAD!!!