I need some help with delayed ejaculation.?

[RissRoss]

Im 21 years old, met my girlfriend about 8 months ago, she was my first girlfirend and i love her to death. We waited about 3 months to first have sex, and i have not been able to ejaulate using her at all. I can *** in front of her, but not when she tries to do it via oral, hand, or intercourse. I used to masturbate A LOT, and feel that maybe i have destroyed my sensitivty. When i first started masturbating i couldnt go using my hand, i didn't *** that way until i was about 17. We have been very frustrated and she thinks i don't find her attractive, I'm afraid that this may be too much for us to handle and that she may leave me. I love her with all my heart and just want to give her what she wants and needs so badly. She has even gotten to the point of being mad at herself if she orgasms during sex. I need help, I feel so alone, and that I'm hurting her more and more each day. I want to marry her and have babies, but im starting to feel that I am just unable to give that to her. I just need someone to talk to that has experienced this before. Does anyone know of a way to just not put pressure on yourself, or to be able to relax or take my mind off it? Anybody, please im desperate.