Orgasm Help !!

So I've tried fingering myself and I've tired clit stimulation and I've tried the water faucet masturbation and I think that my body hates me because I can't orgasm to save my life. My whole body clenches and I feel like I'm about to and when I think I'm about to, I don't. It's very frustrating and I'm pretty sure when my girlfriend is touching me and stuff it doesn't make her feel like she's touching me right or it doesn't feel good. It feels so good and I've told her this but she's very self conscious and it gets in the way of her confidence. I have no idea why I can't?