> I'm extremely sensitive to bitter flavors, black coffee is a lost cause for me.

Perhaps coffee just isn't for you? The bitterness is part of what is enjoyable.

Tea is probably more your thing.

try high altitude grown coffees from East Africa, usually little to no bitterness

You can mix in a tiny (like a few specks) of baking soda or some salt in the ground beans before brewing. I do it for culling acidity in decaf, but I think it helps with bitterness, too. There’s also “Kona Red” coffee if you want to just try what it can be like done well.

A Cappuccino is delicious, lightly sweet and hard to make at home. But you may try it out.