Its a HUGE problem, not just a bit. Besides, Antibiotics aren’t all equal, as each has its spectrum of efficacy and specific bacteria that it either kills or inhibits. Take the very large class of cephalosporins, for example. There are 5 generations of them, with the bugs succeptible to them moving from Gram positive to Gram negative with each succeeding generation, for the most part. Also, resistance to these drugs vary with bacterial families. Unless one is trained to A. correctly diagnose the illness, B. correctly identify the probable pathogen causing such, and C. correctly choose which AB is effective against this pathogen in this particular locale (since drug resistance varies with geography due to incomplete spread, thankfully), one is groping in the dark, even if the pharmacy is well lit.
In the Third World it is actually easier, since only the oldest and cheapest drugs are available. In India, for example, Chloramphenicol is the drug of choice for most illnesses, and it costs about 2 cents a pill to make. True, it does kill great many classes of bacteria, but, in a significant percentage of patients, it does the same to their bone marrow, and irreversibly. Despite conspiracy theories that it was banned in the USA to allow more expensive still-patented drugs to be sold instead, the truth of the matter is its inherent danger of use. Of course, when faced with certain death from cholera or a possible, although generally fatal, aplastic anemia, one chooses chloramphenicol.
The moral of the story is – either get yourself an MD degree, or find someone who has one and let only them prescribe your antibiotics.