Is it normal that i can't always make myself orgasm?

I'm an 18 year old girl, and I'm a virgin. I did have one sexual experience when I was 13 but it was so long ago, and neither of us came, so I don't really count it. I sometimes masturbate using the bathtub facet, a back massager, and occasionally my hands. I don't know why, but I can get an orgasm from everything but my fingers, which is how I want to come. I always try and think I'm going to come but then I end up getting bored because of how little I like the feeling of fingering myself. Is there something wrong with me?