I usually review all of my games by myself but in this game I have no idea what went wrong.
I played White in this game and I won, but I was wondering why Black resigned? In my opinion white cannot win the game-deciding-ko. I'm sure that I lost this game.
In this whole game I felt like black was far stronger than me, he picked fights everywhere and lived almost everywhere. In the opening it felt like he was overplaying by attack my UR corner group.
After I managed to live in the bottom left corner I felt like I was ahead, but that soon disappeared as you can see. Black played so many moves I dind't think of (the invasion on the upper and left side) but they didn't felt like plain "overplays" but like probing for aji, so they all seemed good.

Since I felt lost almost during the entire game I would appreciate comments of almost all moves. I certainly played bad moves, but I'm not sure where they are.
I hope someone can review it and point out my mistakes.

From my count, even if black wins the ko, he has about 40 points on the board. White has at least 40 points just on the left side, not counting the large bottom group or the top right group.

Yeah, I don't think black wins, even if he wins the ko.

W14: What is this? I'm quite sure this isn't a joseki move, and I don't think white gets a good result if black plays hane at R17. After the next two moves, it reverts back to joseki as if white played the 3-3 point instead of R16.

W18: This might be a bit early. It isn't so bad with D17, but perhaps you'd do better with something around K17 later?

W22: This makes the 2 white stones at M17 and N16 a bit over-concentrated (you have three stones basically doing the work of one).

W36: This seems to force black to secure more territory on the right side. I like coming out around M12 better, and think about invading the right soon.

W46: Maybe white should play around O8/P9 to prevent being sealed in and killed? Or is it safe? I think M18 takes away black's eyes, allowing an assault on that black group, which would give you lots of strength to invade, even if you didn't kill. If you invade, I prefer R3, even though black would end up with a wall. With O3, black gets thick anyway and white probably ends up with a heavy group.

W64: I'd P8 first.

W66: I’m not sure those 3 stones are worth anything. Black basically connected with P8, so both groups are safe. Consider O3 or Q3—definitely bigger unless I’m missing something.

W76: Naah. I’m honestly not sure how to handle this white group at this point, but I’m pretty sure this doesn’t help you. P6 or L3 maybe? I thought about H3, but then you’d be giving up the white group for dead, which I’m not sure is best. (You can still try to kill with N18 I think).

End of comments, but I think the game is about even at this point, and maybe some fighting/reading mistakes followed.

B move 21 (R12) is sente against the corner; W usually responds at Q13. You got into early trouble by letting B scoop out your corner base at move 25 (S15). B took control of the game and profited on the side while chasing W out into the center.

Apart from that early mistake, you generally played better than B. Many of his later moves were overplays, chasing a not-very-weak W group, which you punished correctly. For example, the exchange 39-40 is terrible for B, and the W tenuki at move 46 was good. The exchange 49-50 was again terrible for B; in the following moves W made territory on top while B played dame.

Move 66 was a bad reflex, as Judicata noted. You had a golden opportunity to settle your only weak group and take the lead. After B got to launch a severe attack on the bottom, the rest of the game was a horrendous fight from one end of the board to the other, much too complicated for me

Thanks for all the comments!

@skydyr: are you sure? I did count the top-left black group as alive or at least as seki. Is it dead? I'm really bad at life&death. In the game I thought I can kill by forcing his eye shape to a dead one, but then I played elswhere because the best I could find was a seki (didn't fell like enough). And even now I can't find a way to kill it. So if Black wins the ko and this group lives in seki White loses the game.

@judicata:
and you are right, is just me trying to save everything. I should have played elsewhere.
Your comments help a lot, now I know what I could do better.

@mitsun: Thanks it's always nice to hear that I played well on some moves .

I did miscount. For some reason I counted the center left black group as dead. That said, it's a huge ko, and I thought white had more threats. There's one for black in the bottom left, and maybe three against the top right/center group. I don't read a local threat for black crawling on the first line. For white, there is a threat in the bottom right, a threat to rescue the stone in the center and cause big problems for the then cut top-right black group, a couple more push and cut threats for that group, a threat to kill the top left which still preserves seki, and the threat to save the right side stones. Plus, it's up to black to find the next threat.