Any help on this game will be appreciated

Also any fundamental game analysis would help.

3. Bd3. This move prevents you from moving your d-pawn. Now you are unable to develop your knight on b1 or your bishop on c1. Seems like a bad setup. You should try 3. e5 instead.

By move 11 you have a worse pawn structure due to the doubled and isolated pawns on the kingside. Against a strong opponent, your position is nearly losing.

12. b4. This move doesn't help you. It just makes the d-pawn isolated and therefore weak.

17. Ng3, this loses material because the pinned knight will be attacked.  You would lose material anyway here after the king moves because black can take on f3, but a knight is worse to lose than a pawn. Your position was lost, but if you are still playing, you should try to see all the tactics you can.

Actually I think 3. Bd3 isn't all that bad. In fact, I think it is an opening system developed by IM Danny Kopec. The problem is that you followed up incorrectly. The idea is move the Bishop to c2, play Nf3 and then d4. It sets up a sort of Ruy Lopez situation. I wouldn't play it unless you study up on its theory, you can easily go wrong.

In this Kopec System black is ok right from the opening especially at 5.exd5. The only improvement I can see from there for white is 8.h3 where I still prefer black because of the bishop pair with no more opening problems.

I believe white's problem started from 4.Nf3. I think better is the immediate 4.Bc2 which makes 4...d5 less annoying.

I agree about the doubled pawns and isolated pawn.  The isolated pawn also slows down your being able to develop your bishop since it must protect that pawn while the black rook is on that file, and if you move the pawn to let the bishop out you lose the pawn.  After move 14 all white's pieces are on the back row, while black has a knight and rook developed and a path to the attack for the other rook.  This allowed black to attack and win quickly.