How do you deal with tokophobia?

My parents were teenagers when they had me and all my life theyve stressed no children, no sex, your too young! If you touch a boy, your likely to get pregnant. So on an so on. It happens so frequently that I have developed tokophobia. I’ve been with my boyfriend for six years. I trust him and I’m physically attracted to him. I just can’t enjoy sex without the fear of becoming pregnant. It’s not fair to him and hard for him to understand. And yes, we practice safe sex, BC, protection, and pullout. Even with all these precautions, I panic and become super paranoid until my period comes. How can I feel better about this?