Confused About My Sexuality?

Okay so basically I have been under the illusion that I have been gay for about the last two years and have masturbated over gay porn daily but recently I'm just finding it harder to climax and even get hard while when I watch straight porn it makes me slightly uncomfortable however I do climax easier. In terms of feelings I've fantasies about guys but I've had a small crush on a girl once. So what is my sexuality- this is really confusing and a pretty odd case in my own opinion!