Use "so much" to describe an amazing or surprising amount of something. "So much" is more than "a lot" or "very much".

You can only use "so much" for things that aren't countable, like liquids (water, gasoline, soup), emotions (love, fun, interest), and so on. For things that you are able to count, use "so many" instead:

There are so many people in New York, it's crazy!