Pain during sex 😞

Isis
Ladies!!! I need you lol so my boyfriend (19 years old) and I (also 19) just started having sex about a month or two ago and I'm aware that having sex is bound to hurt the first few times we do it but my question is, when do I know when that pain is normal? I'm asking because every time we do it I feel some pain and I kind of imagine him hitting like a "wall" separating my vagina and my ass and the pain itself mainly comes from getting like brief back cramps when he's inside me. So is that the pain everyone talks about feeling when they first start having sex and does that mean it'll eventually go away? If there's anyway I can get rid of the pain the next time we have sex, PLEASE let me know! I'm 19 so I'm sure you all know my hormones are going crazy at this age lol we've been together five years so I think we've waited long enough. Now I just want us to enjoy having sex but it's kind of hard to do so when I feel so much discomfort. Any advice is appreciated, THANKS!!!Â