What I could have done better?

I played this game yesterday against 1900+ opponent.(45/45) I lost this game with white. I was bit passive and my all plans were read by my opponent and at later stage I was out of ideas..I will appreciate suggestions on my game. 

Your comments are not helpful at all. Instead of saying move X was better, this is a mistake etc., let us know what you were thinking when you played a move. In other words, what was your plan? What were you trying to achieve? If you did not have a plan, then you should study the opening and look at the possible plans for white. In your games, you should form a plan and your moves should be the ones that help you achieve that.

Thank you @anon23547 for pointing out. I have updated annotation with my thoughts during the game. I have only annotated few games, so I am not good at that though. 

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At move 16, you have a very nice position.  By move 21, just five moves later, your position has deterioated.  Look at it: compared to move 16, your Bishop has retreated to a worse squar and your Rook is now staring at your d-pawn instead of pressuring the half-open file.  In comparison, Black's pieces are slightly more active compared to move 16.

This little analysis suggests that you misplaced something within these five moves.  I look at 17.Qg4 instead.  This gets your Queen out, it looks at the enemy King, it allows your other Rook into the game (which, in the main game, it suffers on b1 for most of it) and you are threatening tactics with Bxg6 (ie, Bxg6, then Qxg6+ and Rh5).

Your plan of exchanging Bishops is also positionally suspect.  What is Black's worst piece?  The light-square Bishop.  Why try to trade it when Black usually struggles to find any active job for it?  It may be viable in this particular situation, I'm not sure, but I think it's the wrong idea.  If you want to target e6, bring your Knight to f4 or c5.

You eventually got outplayed after move 20, but your position after move 10 was quite nice.  You just needed to manage the transition into middlegame better.

Thank you for your response. You are actually right , I did misplaced something between move 16 and 21. I think that is 18. Re3 which forced me to defend 19.Bf6 with 20.Rd2. otherwise if I had played 18.Re2 then I could have defended with qd2 and Rad1. Also 21.Bf1 was also bad choice, 21.Be2 and Bf3 later would have defended my weakness of f2 pawn which in the end proved decisive. 

I considered and wanted to play Qg4 in the match, but black will play Bf6 followed by e5. 

Actually when I first looked at the position I also thought his bishop is bad. But given he also has other Bishop and dynamic nature of position it wasn't that bad decision in my opinion. It is not closed position he will play e5 at some point and then bishop pair will be better than bishop+ knight. But I doubt he will be able to play e5 any sooner. So I agree I should not have played it immediately.