Here is my analysis
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(EDIT: Just checked that there were really short byo-yomi periods, so the later mistakes are understandable.)
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Here is my analysis.
I think in this game you are not reading well. Many times you have a good position only to immediately give away that advantage, or you have a very weak position and don't reinforce it.
(EDIT: Just checked that there were really short byo-yomi periods, so the later mistakes are understandable.)

Black botched the 3-3 invasion in the beginning by playing the hane underneath, however...
This was an overplay. White should just atari the cutting stone and push it a few times, then make an extension for both groups while Black is still trying to run out in the center.
This is so painful.
Overplay by Black. If Black kept pushing, he could have killed it. Which means that you should have immediately given up the stone to extend on the top.
Why play this move? You have so much thickness now, I would want to play an enclosure on the bottom at R6.
Just connect at Q4, and Black's attach seems silly.
- Why? This is so small and Black gets to hane at the head of two stones. It really wastes your thickness on the top after this.
Tenuki is premature, you need to protect your many cutting points. After B cuts at Q4 and extends, the game seems difficult for you.
Pushing is slow. Jumping is better.
138 This was a huge mistake. Your left side group is very safe, but your right side group is quite vulnerable. I think Black can kill the whole White group with 141 at O10. Black could even play something like O6 to live locally.

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....White should just atari the cutting stone...