If the presence of vegetables can make you gag you may have a deeper issue regarding food. To break some lifelong habits and tendencies can be tough, but worth it!
However, steaming veggies makes them into the most bland mushy food ever. Try roasting them in the oven with a little salt, pepper, and olive oil. They get kinda cripsy and (I think) delicious. Steamed brussel sprouts from grandmas house were so gross as a kid but now roasted brussel sprouts with a sweet chili sauce?? amazing. 