I gave up sugar in my tea and coffee long before I became diabetic. When I was dignosed, I had to give up other sugary thngs too but, I could do it with the knowledge that I had changed my perceptions on how things should change before, so I could do it again.
I have managed to kick the association between sweet things and finding them tasty. However, I still need a crunch or bite in certain things and biscuits are a big temptation. Cakes and buns are no problem. I don't fancy those because they are not crunchy, but I managed to give up smoking so I'm not going to cave in to ginger biscuits.
You can use a sweetener like Truvia in your tea though. It is a beta carb sugar, ie it doesn't get digested. It is also very sweet and you won't need even a quarter of a teaspoon, but it is not bitter like a sweetex. I use a tiny amount in porridge, because I have to be careful about the salt I eat.