Why is sex so painful?

Two days ago I tried to have sex with my boyfriend (I was/am a virgin) but I found that him just putting it in a few inches was extremely painful.  yesterday and today I've found that I am extremely itchy down there.  He was wearing a lubricated condom at the time, (I was also very wet so lubrication wasn't a problem) could I be allergic to latex or the lubrication that was on the condom? If not, what could be going on and how can I get past this?