LOL yea i had that problem once, I was so horny I almost went crazy that it wouldnt go in. The problem is, maybe shes a virgin.
Make her sit on top of you and let her grab your **** and find the hole. Use lubrication. And if you have your **** right next to or touching a ***** and you cant get hard LOL damnnnn maybe you just dont like *****. Na all kidding aside, A couple of my friends told me that their first few times having sex, they were so nervous that they couldnt get it up. A good idea is to get her to suck your ****, and just relax. BELIEVE ME you'll find a way to get it in.