Yes sometimes it does have alot to do with mentality why people enjoy snorting them I actually used to be the same way until I discovered oral hit me better and I felt the medication fully.
But some people do actually get about the same B/A from snorting as they would have if they ate the pill or even more because some people don't absorb oxycodone as well through the stomach. The bioavailability varies person to person depending on how efficient their body absorbs it and its metabolites. For instance Special populations, including children and those with liver/renal failure, have a unique profile that must be taken into account in order to maximize efficacy and reduce any adverse effects. Oxycodone is metabolized by the cytochrome P450 enzyme system in the liver, making it vulnerable to drug interactions this means many other drugs can also affect absorption of oxycodone. Some people are fast metabolizers, which can result in reduced analgesic effect, and increased adverse effects. Others are slow metabolisers, meaning without care its possible to result in increased toxicity without any improved analgesia at certain doses.
Typically The bioavailability of oral oxycodone averages 60–87%, with rectal administration yielding the same results. Intranasal varies between individuals with a mean of 46%. I'm one of the lucky ones who get a average of 80℅ bioavailability when taking oxycodone orally but some are more in the 60 ℅ range so to them it makes more sense to snort the stuff to get a faster onset if you don't mind messing up your nasal cavities.
Basically everybody is different and not everyone absorbs it the same way so the OP may very well be one of the people who doesn't absorb oxycodone effectively in the stomach.