hi everyone! please help point out my worst mistakes or stuff that others haven't pointed out!

(this game was kinda blitz(20s/move))

Moves 20 and 26 look like you are trying to play too competitively. Black has lots of strength over on the right side, and you have to concede something to him because of it. Jumping in is just going to get you into the wrong side of a lopsided fight. ( Note that both of those stones eventually died )
It is far better to allow him to keep some territory on the right side and take one of the many huge points on the rest of the board. ( K16, K4, D10, etc )

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White moves 28-40, I'm not sure what your plan was. Is it to seal black in, or to reduce, or to create outside thickness?

Black's alive on both sides, so cutting has no value, and capturing Black is not going to happen. Yet moves like look like you are trying to take liberties away from Black. When you try that you only end up taking liberties away from yourself.

Then makes you heavier and is small. I feel is a bad sente. Though trading outside for inside, the problem is that it's otherwise not really useful. You played so close to Black strength that you are bound to leave cutting points or make yourself heavy or both.

It looks like you were banging your head against black's strength to try to make something happen. It's better to just reassess, re-plan, and try to use your loss as aji instead of doubling down on it.

thanks for your pointers guys! on hindsight, i should probably not have chosen a wild, casual, blitz fighting game to put up for comments. sorry for that. though i do need help on those basic shapes which i instinctively throw out in blitz games.