I'm a virgin and am having a hard time getting an erection,

There seems to be some sensitivity in the penis and its just really limp... I can start it but hard to maintain an erection. This has been in the last several days, whereas before when me and my girlfriend were kissing everything seemed normal and acting just fine. But lately its been weak, and sensitive. Very strange and scary. Never had this problem, and I don't really know what it could be... please help

Try not masturbating for several days and just leave it alone. It could be all in your head. If you are taking any medications, that could be the cause. If you are taking medications do some research on the side effects.