Getting married, but he doesnt know how to please me

[Wife to be]

He really doesnt know how...I have given up hinting on how he could do it. If I make a move for a position that is likely to bring me to climax, he switches position, possibly because it doesnt satisfy him enough.

Sex ends with him satisfied, usually quite quickly and me very disatisfied.

I know you will all say talk about it, but in confrontational moments I can end up sounding offensive. I dont want him to feel he is useless in bed.

I dont want this to be a stumbling block in our marriage.

[Wife to be]

First time posting here, this shouldnt be in the 'same sex' room! I'm posting this elsewhere!