If this is something you'd truly like to work on, not out of a sense of guilt but because you would enjoy occasionally reciprocating, there are a wealth of resources out there for the enthusiastic amateur (you are far from the only would-be blow-jobber whose spirit is willing but gag reflex is weak). You have more options than "no blow jobs, ever" and "regular whole-hog sessions to completion that result in vomiting."
Mallory OrtbergDon't badger people without children into admitting the secret desire for children you're sure they have to you! Don't badger anyone! Leave the badgering to the badgers.
Mallory OrtbergEnjoy your relationship with your boyfriend and don't worry about the people or situations you dream about. Once you wake up, they're over; let them go.
Mallory Ortberg