so = very too = overly, excessively

'Too' is used before an adjective or an adverb to say more than what is wanted, needed, acceptable, possible etc. I have eaten too much (more than I should) I have too much to do (more than I can manage) 'The meal cost too much (more than is acceptable) 'So' is used before an adjective or adverb to say 'very', 'extremely', 'to a great degree'. 'I have eaten so much ( a great quantity/ a lot) I have so much to do (I really have a lot to do). 'The meal cost so much (was extremely expensive).

for example. I eat so much food.means I am full and maybe I enjoy the dishes. I eat too much food.means I am full but I don't want to more. Like others said,one is hope much,one is not hope,even for complaint.

相同：都是很多的意思 不同：too much 是觉得太多了而不怎么好,就好比吃多了撑住了。 so much 就是很多的意思。

One is hope much, one is not hope