New things to try?

Sooo bit of an awkward question, hence me posting here, but how do you and your SO spice things up? He likes some positions I’m just not comfortable with and that don’t feel comfortable for me, and I feel bad not doing them, but it cant be helped. He’s my first but I’m not his, so occasionally I feel like I need to be more... I don’t know, kinky to make up for lack of experience?? He doesn’t expect me to do things I’m not comfortable with, but I just need help finding some things I AM comfortable with. Any ideas?