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help me analyse my game please

en.lichess.org/pziUVFeZ/white#16

I did not know the theory, so i played the opening as best as i could and i think i did pretty well, the first thing i don't understand is why my plan of doing f4 is marked as an inaccurancy,he didn't castle yet, so i tought that opening the position would be the best thing to do,the computer suggest to play a4, gaining space on the queenside, but again, i don't see how f4 is a bad move.
The second thing is move 19, i tought that at the time i was better, due to his pieces being mostly on the 8th rank and his king not safe, i was looking mostly at cxd5 or f5, in the end i decided for f5 , because i saw that if cxd5 cxd5 nc7 looks like it is defending a lot of threats, like bishop b5 wich was my main idea, so i pushed f5 to see where the knight was going and to trick him to move to another square, he goes to g5, he is threatening to win mye5 pawn, he looks pretty good and so i just trade him for my weak bishop on c1,wich the computer doesn't like? i don't understand why he suggests bf4, it looks very passive there, and the knight on g5 looks pretty good, there may be sacs on h3 in the future , also my king is on the same file as his rook , that looks scary, i don't want a strong piece like that near my king.
22 bb5, only after i played it i noticed that it was a complete waste of tempo for me, but this was my main plan, i played it almost instantly, also in the future the weak b6 square will be a huge tool that i can use.
24 qb4 is considered a mistake, and i don't get why, the computer prefers qd4, but i want to leave that square for one of my knights.
He protects his knight with the queen wich is bad, as i can leave the defense of e5 and trade the strong bishop to let my rook enter into the game with tempo.
27 nd4, it was my plan all along to put the knight there, the engine suggests e6, a pawn sac to open up the position right away, i don't understand what's wrong with strenghtening e6 even more with nd4,
he responds with rook h8, when he played it i was pretty scared o g4, i tought that i had given my opponent too much counterplay so i decided to close the queen with f6, bxh3, i was annoyed at myself for letting him play that, i only saw that after gxbh3 rxh3+kg2 rxd3, winning 2 pawns, but the computer sees a nice refutation rfe1 wich is forced mate, i did not see that .
he played a5 and then i calculated a forced mate.
Your 8 Nh2 plays a well developed piece for the second time, while you still have undeveloped pieces. I would have played 8 Be3 to bring the rooks to the centre: Rd1 and Re1.
11 Kh1 looks passive: better Be3 to defend against ...d5 and ...Bc5. This results from your 7 Nh2 and 8 f4 plan.
13 b3 looks passive. Why not 13 g4?
15 e5 helps him to gain space in the centre with ...d5 and drives your Bishop from c4.
With 20 Bxg5 you give up the pair of Bishops. 20 Bf4 involves some tactical threats against his queen. Your king is perfectly safe as black is not developed. He cannot sacrifice on h3 with any effect.
24 Qd4 is stronger indeed: more central, defends pawn e5, safe against Be7.
27 e6 was very strong indeed, as the Bishop threatens Bg6+
I played b3 because i wanted to put the bishop on b2, after rook g8 however, i had to leave it on c1
Nh2 is definitely a waste of time. Those backward moves are rarely good. I agree with tpr Be3 does look like the best move. Unless you can find a way to break-through while ahead in development, just keep developing and try to open the center asap. Kh1 I guess was played to avoid Bc5 after e5. Yea..nothing more to add

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