Will this totally ruin my sex life that I feel I have completely lost my sex drive?

I'm still attracted to my fiancé very much. He takes sex so seriously, I can't loosen up when we're fooling around and it makes me feel nervous.Will this totally ruin my sex life that I feel I have completely lost my sex drive?
If you have performance anxiety about sex, you know, where should I put my hand, how should I place my body, what position, etc. it takes away the spontaneity of sexual relations. It is easier to say than to do but relax. If sex getting bored and you dont want to ruin your life, you need to take some actions or try some supplements or pills that will help you satisfy.
No first you should talk to him he sounds like it is a job not something to enjoy that could ruin it if you cannot enjoy it with him that will ruin it for you.