Benoni Middlegame

I keep seeing people say that the Benoni is an agressive response to the queen's pawn game. I just can't seem to make hay with it. What is a good middlegame plan for positions like these, and where does black's "aggression" lie?

Your thinking of the Benko gambit which is agressive.  No one plays Benoni much any more its "out of style"

You put your R on e8 to pressure the e-pawn, then play a6 to play b7-b5-b4, kicking the N.  There are also some ideas with playing c4 and Nc5-d3 (or b3), and ideas with Bd4+ can be brutal, too.  White commits and black counter-punches.  To get an idea of what black can do in this opening, look to the games of Bronstein and Tal in the 1950's--that's where a lot of the theory of this opening was created.

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Study Lefong Hua when it comes to the Benoni. He is a big supporter of it but he also admits that it is not the best opening to play against 1.d4. However, that's only if you are a master that plays very accurately. I recommend using Lichess as he plays there more and the opening explorer is a lot nicer. 

Also, by looking at your game, 8...Nbd7 looks like a mistake because the light-squared bishop is your bad piece  which you should have gotten rid of but instead, you moved your perfectly placed knight to block yourself in

 I always play c5 and then e6 g6 Bg7. It's in my experience a bit more solid.

Did you mean Nfd7? If so, it’s basically the only move that doesn’t lose on the spot.

I’m sorry, it wont happen again.