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please tell me why I can not point my miner towards a specific transaction to get to confirm quicker.
Because mining requires solving a block. The bitcoin protocol automatically adjusts the block solving difficulty every 2016 blocks to keep the average time between blocks close to 10 minutes. That's 10 minutes on average for the entire world's bitcoin block hashing power to solve a block.
If you decide to try and solve a block all by yourself, then the amount of time that it will take you will be 10 minutes times the ratio of the world's hash power that you control.
The bitcoin network currently has a total approximately 370 petahashes per second. If we assume that you control approximately 5 terahashes per second of hash power with all of your miners combined, then it will take you on average:
370000 Th/s globally divided by 5 Th/s under your control times 10 minutes = 740000 minutes to solve a block and confirm any transactions that you decide to include in your block.
That's more than 500 days.
If you have less than 5 Th/s, then it will take you even longer.