This is one of the very rare games in which I am thoroughly outplayed and don't know how I lost. I hope to get some feedback as to what I did wrong in this game.
On the receiving end of an attack
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You weakened your Kingside with 14. h4 and then your opponent did a very nice job of grabbing the initiative.
Casual_Joe is correct. You weakened your kingside and your opponent consolidated his queenside and attacked. Probably the move that stands out to me is 21. g4. Can you give us what you were thinking when you played that move?
13. Qd2? - I think better would have been 13. Bg5, offering the trade and getting your knight in for some counter play. The fact that black plays 13... h6 probably has something to do with his worry about this move also.
21. g4?? That was the really what destroyed your king side defence where 21...h5 leads to an exposed king. Better might have been to attempt for some counter-play on the queen side and trust you have enough to counter on the king side.
23...Ncxe5!! This is such a powerful, quite beautiful move. Really, from here on you're a gonner. However, I don't think your opponent realised what he was doing with it since 24...d4?? allows 25. Ng3, covering the mate on h1. Of course, you played 25. f3??
26. Nxd4?? - better would have been 26. cxd4.
Really, from here, blacks attack is simply irresistible and the game is over. I just think your opponent was very strong, hence the crushing, but you did better than I would have in the situation 
In the most general sense, you had to eventually open lines on the queenside or center else black gets all the play. More specifically the move 21.g4 instantly opened lines against your own king, it's all down hill from there.
I didn't like 14.h4 at first but actually the formation after that move is doing a good job of keeping his pawns back (I don't like or understand h5), well, I guess he can add Qd8 even if it stays on h4, hmm. I'm trying to find a way for you to play something like c4 but it's difficult (13.c4 dxc4 14.d5 exd5 15.Nf5 intending Nd6+ is interesting but ultimately bad for white I guess).
a4 bishop and g3 knight give the impression that you're not coordinated yet. 13.Bg5 is a good start, getting rid of that minor piece. Then even Bxc6 to leave black trying to utilize his d7 knight and light bishop. Hah, and then I don't like anyone's minor pieces lol. If you hold your pawns back then after g5 by black maybe you can sink a knight on h5 (giving it a job) and blockade on the light squares.
This position isn't a quick fix IMO. You're going to have to be careful on the kingside while trying to open something on the queenside. Slow maneuvering stuff for both. In any case that's the idea. Also g4 was bad and h5 is suspect. Sorry I can't help much more than that :)
The idea with g4 was to not allow the pawns to kick out my knight. I wanted both knights to be defending the kingside.
Thank you to everyone for the really helpfull advice
As a general rule, you should not move Pawns on the side of the board where you are under attack... unless other defenses are clearly useless.
9. Bb5 seemed pointless. Better 9. Bd3 or 9. Be2.
With a Pawn chain stretching from b2 to e5, your natural play was with f2-f4-f5, so perhaps you could have considered playing Nf3-g5 (-h3) before Black ruled it out with his Be7 move. That would have allowed your f-Pawn to advance.
Once Black had castled Q-side, you should have tried to open a file on that side of the board. Advancing your own K-side Pawns was suicidal.
I've seen it backfire though, which is interesting... where there's opposite side castling but due to extra space and minor pieces white may try to seek his play on the kingside anyway.
But here with the knights in the way... I don't know, black had the kingside play for some reason. I say some reason, but yeah that's that norm, I just wonder what would have to be changed to make the kingside white's side again so to speak.
waffllemaster wrote:
.. I just wonder what would have to be changed to make the kingside white's side again so to speak.
Getting White's f-Pawn forward would have been a good start. That would have made it difficult for Black to expand on that flank without allowing the center to come open... a factor which tends to paralyze a flank attack.
But could white open some kingside lines and get the better of it? I know it's counter-intuitive... but with space and piece superiority it should be quite natural once it appears on the board. I guess not possible in this game perhaps.
Haha, and in that case what if it became white attempting a kingside attack and black trying to counter by opening the center. Haha, how backwards.
Anyway back to reality. I like your suggestion, if f4 could be played looks good.