Difficult!

U think to make a cup of ice lemon tea is simple. just put tea bags in the water, add some sugar and some slices of lemon, and then done? U r wrong! i used half cup of water, 5 tea bags, 2 tablespoon of sugar, 3 slices of lemon and ice to make lemon tea for 2 persons but it was toosour. I cut the lemon quite thin about 0.3cm, god it is still too sour. the amount of sugar is already enough if too much will get diabetes, ok! the amount of water is reasonable already because i gonna add ice, the ice will melt. 5 tea bags for 2 person is too much don't u think so? then, what is the problem?! why it is so hard for me to make a lemon tea taste like a lemon tea?!