The previous comments are all valid so let me try to dig more into the question "why are you making these mistakes".
In general your moves give the impression of being both strategically aimless and technically flawed. I don't know what the time settings were but I wouldn't be surprised if this was a fast paced game. On these assumptions, I have a few recommendations:
1) play a slower paced game and/or use the time you have to consider a few moves and pick the one that seems to give rise to an acceptable sequence
2) apply basic technique or "haengma" such as one space jump for defense, keima for attack, don't attach to weak stones ...
3) apply basic strategic principles such as cut/connect on a large scale, attack/defend weak groups, play the largest area when all groups are strong
A few examples:
 after a pincer, which denies a base, you could play the basic move for defense, i.e. a one space jump
(as pointed out, block at  and approach the corner at  )
 instead of cutting aimlessly, leave this area alone and reinforce the upper left corner
 instead of invading his base, build the upper side
 attaching to a weak invading stone will make it stronger; attack from a distance instead, like with a capping move (boshi)
between 95 and 111 you have the right idea to build territory in the lower left center by attacking White's weak group; alas, you have to defend your own top group, which you have correctly identified as weak
:b111: Here you have to connect your big central string at E14, instead of connecting the worthless stone at G16. Now it's White who cuts and connects his major groups and you have no more leverage against him.
:b157: This move is not sente. Luckily the opponent answers. On the right side you can capture a stone. That move is worth much more. It's moves like these that give the impression you are playing on auto-pilot and not really considering alternatives.
Good luck!
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- at least play the tiger mouth connection, but even better: extend to O14 to take some control of the centre/diagonal.
- better play S3 to quickly settle and not give too much secure territory.
- again just sits on the side, doesn't protect the corner, doesn't threaten White. Better F3.
- J3 sits too close for this. Better play C5 for double hane (likely re-taking the corner) or C6 for sente or fight.
- should keima to the second line, I think, otherwise black can revert to the double hane joseki by just pushing through.
- just cut at B6. White has to capture, you take the corner.
- too early
- tenuki to top left, or capture the ladder stone
seems a bit premature. You finish in gote. If you really want to play 
at S8. Either White responds with 
at S10 and you get sente, or White plays elsewhere but leaves a weakness.