Coffee is a very bitter drink. I don't know you of course, but my guess is that what you like more is the dopamine caffeine releases in your brain, which you've now associated with the taste. You can try and experiment with good decaf coffee to see if it is actually the taste that you like.
Bitterness is very loosely defined in general - we know what ‘sweet’ and ‘salt’ are; bitterness is sometimes associated with some sort of acidity, but a lot of people seem to just describe things that have strong flavor but lack sweetness as ‘bitter’. Lemon, chocolate, kale, and red wine are all sometimes described as ‘bitter’ and they have virtually no common flavor compounds.
It’s definitely possible to like the taste of coffee. My evidence for this is that when I drink coffee that tastes bad, I don’t like it as much.
I experience lemons as both sweet and sour, but certainly not bitter.
[Edit] Perhaps the peel is bitter; the white pulp is certainly bitter.
Many people cut their coffee with milk and sugar to complement the bitterness. But then they typically enjoy the resulting flavor, too.
I've known plenty of people who loved caffeine but not coffee. They drink soft drinks or take caffeine pills.
Believe people when they say they like the flavor of coffee.
Personally I don't find well made coffee bitter at all.