Am I the only one who literally can not kill anything with the Tac45 or B23R?

I can do well with the five-seven, executioner, and mediocre with the Kap40 but I can't for the life of me go positive with the B23R or Tac45. I can't figure it out and it's making it impossible to get headshots, let alone kills altogether. I don't know what I'm looking for posting here but I just need to vent because my night has been extremely frustrating struggling to do well with the supposedly 2nd and 3rd best pistols.

It came to a point where I was shooting an afk guy and missed an entire tac45 mag. I just can't aim with these 2 and the lower RPM is really holding back my trigger finger coming from the fast firing 5-7.

I also didn't know that apparently the tac45 goes out to a 6 shot kill but that's more of a random fact I found out, not related to me sucking with it.

Can anyone recommend a class for the tac45? Maybe your suggestions are better than my own judgement for pistol classes.