Painful sex? I need advice!

This is extremely personal to talk about, but none of my close friends can relate to how I’ve been feeling. I am 20 and lost my virginity in October. My bf of four years was a virgin as well. The first time we attempted sex it was a horrible burning pressure feeling. I felt this was normal but decided it was too much and to stop. Well the second time was the same way. The third time the same but I kept going trying to get this over with. After almost two hours it was unbearable to me. And the forth time was the same way. It’s gotten to where I dread sex and don’t want it because it’s so painful. I’ve looked into this and I’ve saw PCOS, Latex Allergies, or simply arousal problems so a silicon lube was advised. I just don’t understand or know how to fix this issue. It’s obviously made things awkward between us. We still love each other but he feels like he can’t please me because he doesn’t know what he’s doing. I just feel like this is a me problem though. Help?