I know most find it embarrassing to talk about masturbation. Its very normal for children to stimulate themselves. Let me ask gently - are you saying your parent accidentally stimulated you there? Is there any sexual abuse in your past? Some who have been abused will have lack of desire and a bad reaction to sex? If your BF takes his time and lets you control what happens while using enough lubrication - this might help. Is there any pain during sex? I'm a mother of 2 girls 9 and 13 so I don;t mind discussing this here in a non embarrassing way. You're lucky to have an understanding boyfriend.