this is like the first time ive ever gotten an ask like this and omgggg. hi!
personally, i dont think you should worry about disappointing them. yeah they might say they dont want their kids to be gay or whatever, but theyre going to love you no matter what. and you have to believe that. it might take some time for them to adjust and stuff, but they’re still gonna love you and care about you. i think you should just sit down and talk with them, or even if youre alone in the car with your mom or something. and just tell her/them. dont apologize for it, just say you want them to know so you can be comfortable! i think everything will turn out fine in the end <3 and good luck !