Please help me, I’m reluctant to have intimacy

Hello everyone, I want to share my problem with you and see your opinion. I can’t have sex, I have this block that won’t allow me to do it. I don’t know why. I’m not virgin and I haven’t been raped or anything.. I really like kissing, touching hands, cuddling but I’m not interested in sex. That’s why I don’t even look for a relationship because of course I will be requested to do it. I think I will never find relationship because it seems impossible to me. How can i fight this problem?