Thank you for sharing. It takes courage to put a game out on the forum. Noticed a few things that you can work on to get better. I would suggest you look at master games in the Queen's gambit declined line because your game seems to lack a plan. You offer a lot of Queen trades and it seems that the only reason you are doing this is because your opponent is better than you. When you have the better position or at least when you are trying to prove that your position is better, you don't want to offer trades, especially at the cost of weakening your position. It may seem like this is getting you closer to a drawn game, but it is really not. Looking at the board at move 6...Qb6, it hard to understand what your opponent is trying to accomplish. He has a bad knight on a6 and his Queen is not well placed. His pawn structure is telling him play in the middle and on the king side, but he has two important pieces jammed into the cramped Queenside. Most Queen's gambit players (playing white) are looking to push their e-pawn to get an attack going on the kingside, so Qc7, followed by Bd3 or Be2, followed by castle would be a good start. I think if you go over a lot of master games in the Queen gambit, you'll see the plans that both sides are trying to accomplish.
I agree with Redglove about having no plan. The first 9 moves are fine, both are just developing. In these kind of positions/openings, White usally put something on e5 , slowly putting pressure gaining more space and possible attack the kingside(when black has castled).
However you need to be flexable, simple ideas of c4 or e4 are also possible, these kind of positions can have mutiply ideas, White has no weaknesses. However against stronger opponents you need more then that, a good plan/idea how to continue.
I don't like 10. Qc2(too slow), prefered 0-0 and putting something on e5 or push c4. I think the alternative 10. 0-0-0 is a mistake, because Black is better prepared at the queen side and the White king is weak at Kc1 after c5.
After 10. ... c5 Black is already a bit better the Queen on Qc2 is a bit misplaced because the half open c-line(soon or later a R will be placed on Rc8 with tempo lost for White).
I am not sure if Ne5 is the best, but it is playable. Freom here you pick the wrong plan. I think the White Night should be on Nd4 to pressure black position, with the idea to push f4 and f5.
I don't like 23. Bd3, again too slow. Maybe a more active plan is b4! with the idea of b5, another idea is e6!. In general i think your style/weakness is too positional, too passive. It remember how i played like years ago on the chess club, with this style i didn't win much. In general it is important to put pressure on your opponent to make a mistake, playing too safe won't win games against stronger players. Try to unbalance your positions more, play more focused/active. Anyway my 2 cents =)
