Oral Sex

Hi guys, so idk what it is but for some reason i have a really hard time with oral sex on my boyfriend. I guess i kind of get in my head and feel like i’m not doing it right and he doesn’t like it. i’m afraid to ask him anything because i don’t really know what to ask if that makes sense. i even bought deep throat spray but i still only did it for like 2 minutes (not even) before i started getting nervous and stopped. any tips or advice would be really appreciated! 😩