Oral sex

So me and my boyfriend have been together for a year and a half, we are both graduated from high school. I’ve always been kind of shy and insecure about my body especially when it comes to being intimate. I hate it because I want to explore and try new things as does he but he is thankfully very understanding and doesn’t pressure me. He always hints towards him wanting to go down on me and vise versa but idk how to feel about it. I think its kinda gross to give him a blow job but idk because I’ve never tried and I don’t want to embarrass myself. I’m also too insecure to let him try it but I want to try new things and spice up our sex life. Any tips on how to overcome the insecure feeling during sex and things we or I could try??