Too vs. Very

Do these two sentences have the same meaning?

The tea is very hot.    The tea is too hot.

"Too" and "very" are both intensifiers.  They make the adjectives stronger.  In these sentences, the adjective is "hot".  However, "too" and "very" do not mean the same thing.  The word "very" means a high degree of something, but it's still okay, and it's still acceptable.  

"Too" is a negative intensifier.  It suggests excess, something that's more than we want, more than we need, often with a negative result. 

If I say "The tea is very hot, it means the tea is hot to a very high degree but I can still drink it.  However, if the tea is too hot, it's hot to the highest degree and I cannot drink it or I will probably burn myself!

Another example:  "The music is very loud." The loudness is a high intensity, but I can tolerate it.    However, if the music is too loud, it's more than I can tolerate.  

It's NOT correct to say "I'm too happy" or It was too much fun.  "Too" is negative and "happy" and "fun" are positive, so "too" does not work in the context of "happy" and "fun".  

Sometimes you still might hear someone say "I'm having too much fun!"  or "Oh, that was too funny."  This is a 'play on words' and it's meant to be cute and funny but grammatically, we don't say "too happy" and "too fun".