orgasm guilt??

my boyfriend has tried fingering me and rubbing my clit to get me to orgasm multiple times, but every time he does, i start to feel really guilty bc i know i take longer to cum than he does. i know i'm capable of orgasming and if i stick it out he would be able to make me cum but i just feel anxious for taking so long and it turns me off so it makes it even harder. any advice on how to get out of my head and stay turned on while he's fingering me?