Orgasm help

So I have only been able to have an orgasm with my husband when I am in control and he thinks I should be able to anytime we are having sex if I truly love him and I can’t get him to understand any differently is there something wrong with me is he right should I be able to orgasm every time in any position if we are truly in love I don’t fully understand it myself or is there anything I can do to help like any kind of supplement I can take or anything to that affect