What do i do if my girlfriend is afraid of having sex? /u/Independent_Goose346 Sex

We are both 21 and together for about a year, and i love her very much, we do a lot of thing together, but when it comes to sex, ive tried a lot of things, but most of the time she gets stressed and says that it hurts. It doesnt bother me THAT much, we do other things in bed and im happy with her. But (since im not a virgin) i know how good sex is, and trying very slowly to try to make her comfortable, and the problem is penetration. when it comes to insert anything in her, she gets really anxious and scared and immediatly says that she doesnt want it anymore because it hurts. What should i do to slowly show her that after the pain it gets better? (or it doesnt get better?)

We are both 21 and together for about a year, and i love her very much, we do a lot of thing together, but when it comes to sex, ive tried a lot of things, but most of the time she gets stressed and says that it hurts. It doesnt bother me THAT much, we do other things in bed and im happy with her. But (since im not a virgin) i know how good sex is, and trying very slowly to try to make her comfortable, and the problem is penetration. when it comes to insert anything in her, she gets really anxious and scared and immediatly says that she doesnt want it anymore because it hurts. What should i do to slowly show her that after the pain it gets better? (or it doesnt get better?)