@Carollocking - which antibiotics are most effective for a wound infection, or a chest infection?
Who do you think knows more about prescribing - you, with your VAST experience of needing antibiotics three times, or a doctor who has done years of medical school plus the extra years needed to become a general practitioner?
What will happen when we run out of antibiotics that are effective, because idiots (and idiotic countries) have used them for viral illnesses, or used the wrong antibiotic for their infection, or not used them correctly (failing to take the proper course etc) - and this has led to the majority of infections being antibiotic resistant, and when people are dying in their droves from infections we used to be able to cure?
What will we do then?
If you want to be part of the problem (which you would be, if you were buying antibiotics whenever you, with your entire lack of medical knowledge or training), you need to have a plan for how to deal with antibiotic resistance.
By the way, I am not expecting any sensible answer to these questions from you.