HELP MASTURBATION

I'm 23, single, a virgin, and I am so horny all the time, but even more when I'm on my period. I have watched porn, and tried using the shower head & my fingers but I just can't get the hang of masturbating, I find some pleasure in it, but I can never cum or have an orgasm. I need help, lol. I feel like I'm going to explode.