Can't maintain erection, nor achieve orgasm.

Patient : Hello, I am an 18 year old male and have started having regular sex with my girlfriend a while ago. The problem is: 1. I often lose my erection during vaginal intercourse. 2. I find it incredibly hard to reach orgasm through sex(whether it be vaginal, oral, or with hands). Things to note: 1. My girlfriend is attractive and capable in bed, so I'm pretty sure there is something wrong with me. 2. The only times I can reach orgasm is after receiving at least 30 minutes of intense stimulation, all the while trying very hard mentally to bring myself to "come". 3. I have no problem getting an erection, but my penis starts to go limp when engaging in slower sex or vaginal sex. 4. I can reach orgasm much faster while masturbating. 5. I am not circumcised, my penis looks healthy to me, and it is 6 inches long with average girth. Could you please help me? P.S. I am thinking of trying Viagra.
Symptoms:  Erection is weakened often during sex. Sometimes lost completely.

Cannot reach orgasm easily. Often have to give up.
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