Sexting is uncomfortable?

Ok, so my sweet boyfriend of 4 months likes to sext, but I don't really enjoy it, in fact it makes me really uncomfortable. Talking about sex, flirting, and teasing are fine, but I just can't do the more explicit, scripted role play stuff over text. I was raised in a very conservative home and religion, and even though things have changed, there are still things like that that make me super anxious. We have a great sex life in person, no problems there. He doesn't pressure me, but I feel so guilty like I'm not giving him what he needs. What do I do? Help!