How do I make it go in?!

So my boyfriend and I are trying to have sex for the first time together, and im a Virgin. But everytime we try to put it in, it won't go in and it hurts! We tried lube on the condom and stuff but it hurts so much. I just recently got into tampons to maybe help open my areas a little more during my period. But idk what to do... is there a certain angle or something to make it less painful?