The pawn ending was a lost cause, but you could've played it better. After 33...Ke6 34.Kd4 clearly, the pawns run out of good moves and then either a king or pawn will have to make a not-so-good move. You must count tempi.
34...h5! 35.a4 a5 36.g3 g4 and White is forced to move. White can still win, in fact it's not hard, but his margin for error is small.
34...a5?! 35.g4! a4 36.h3 and Black is forced to move. Game over.
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The rook endgame was also lost.
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With the R+B vs R+N, it seems possible to hold the draw, with some care.
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26...c5?? - This is the move that blew the won endgame.
26...a5! If 27.bxa5 then 27...Rb3+ 28.Kd4 Rxa3 with 29...Rxa5 to follow. Black now has open lines and four monster connected passers. If not 27.bxa5, then 27...axb4 is fine.
When I dont make any blunder I usualy go in endgame equal or stronger that my oponent. And then I play like 2yo who just learned how to move peaces.