Why does your tongue hate bitter so much more than sweet?
That instant gag at something bitter is not pickiness - it is an alarm your ancestors lived by.
Many plants make bitter compounds to avoid being eaten, and a lot of those compounds are toxic. Our sense of bitterness evolved to flag them: humans carry about 25 different bitter receptors but essentially one sweet receptor, so we can catch a wide range of possible poisons while still spotting sugar. A strong bitter hit makes you spit it out before you swallow.
Bite into a bad almond and your face screws up and you spit fast. That reflex once kept people from eating something that could harm them, because many natural toxins taste bitter.
Bitterness is a built-in danger signal, not just a flavor you happen to dislike.
It explains why kids reject vegetables and why you have to learn to like coffee, beer, and bitter greens - you are overriding an old safety reflex on purpose.
Bitter = bewarned. One taste, many alarms (about 25 bitter sensors vs essentially one for sweet).
Learn the idea and practice English at the same time.